Boron (B)
metalloidSolid
Masse atomique relative standard
10,81 u [10,806, 10,821]Configuration électronique
[He] 2s2 2p1Point de fusion
2074,85 °CPoint d’ébullition
3999,85 °CMasse volumique
2370 kg/m³États d’oxydation
−5, −1, 0, +1, +2, +3Électronégativité (Pauling)
2,04Énergie d’ionisation (1re)
8,298019 eVAnnée de découverte
1808Rayon atomique
85 pmDétails
Boron is a light metalloid in group 13, notable for electron-deficient bonding and a rich cluster chemistry. It occurs naturally only in compounds, mainly as borates in evaporite minerals and brines. Elemental boron is difficult to prepare in high purity and has several allotropes built from B₁₂ icosahedra. Technologically, boron is most important through borate minerals, borosilicate glass, detergents, ceramics, fertilizers, and neutron-absorbing materials.
An element of group 13 of the periodic table. There are two allotropes, amorphous boron is a brown power, but metallic boron is black. The metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room temperatures. It is never found free in nature. Boron-10 is used in nuclear reactor control rods and shields. It was discovered in 1808 by Sir Humphry Davy and by J.L. Gay-Lussac and L.J. Thenard.
The name derives from the Arabic buraq for "white". Although its compounds were known for thousands of years, it was not isolated until 1808 by the French chemists Louis-Joseph Gay-Lussac and Louis-Jacques Thenard.
Boron was discovered by Joseph-Louis Gay-Lussac and Louis-Jaques Thénard, French chemists, and independently by Sir Humphry Davy, an English chemist, in 1808. They all isolated boron by combining boric acid (H3BO3) with potassium. Today, boron is obtained by heating borax (Na2B4O7·10H2O) with carbon, although other methods are used if high-purity boron is required.
From the Arabic word Buraq, Persian Burah. Boron compounds have been known for thousands of years, but the element was not discovered until 1808 by Sir Humphry Davy and by Gay-Lussac and Thenard.
Pure boron is usually encountered as a dark brown to black, hard, brittle solid with a semiconducting character. Amorphous boron is a powder, while crystalline allotropes have a dark, lustrous appearance; their properties depend strongly on purity and structure.
Most boron use is in compounds rather than the free element. Borates are used in glass fiber insulation, borosilicate glass, enamels, ceramics, detergents, flame retardants, and micronutrient fertilizers. Boron carbide, B₄C, is used in armor, abrasives, and control rods because it is very hard and absorbs neutrons. Elemental boron is used in small amounts in specialty alloys, pyrotechnic compositions, and semiconductor work. The isotope ¹⁰B is important in neutron detection, reactor control, and boron neutron capture therapy research and applications.
Boron is used in pyrotechnics and flares to produce a green color. Boron has also been used in some rockets as an ignition source. Boron-10, one of the naturally occurring isotopes of boron, is a good absorber of neutrons and is used in the control rods of nuclear reactors, as a radiation shield and as a neutron detector. Boron filaments are used in the aerospace industry because of their high-strength and lightweight.
Boron forms several commercially important compounds. The most important boron compound is sodium borate pentahydrate (Na2B4O7·5H2O). Large amounts of this compound are used in the manufacture of fiberglass insulation and sodium perborate bleach. The second most important compound is boric acid (H3BO3), which is used to manufacture textile fiberglass and is used in cellulose insulation as a flame retardant. Sodium borate decahydrate (Na2B4O7·10H2O), better known as borax, is the third most important boron compound. Borax is used in laundry products and as a mild antiseptic. Borax is also a key ingredient in a substance known as Oobleck, a strange material 6th grade students experiment with while participating in Jefferson Lab's BEAMS program. Other boron compounds are used to make borosilicate glasses, enamels for covering steel and as a potential medicine for treating arthritis.
Amorphous boron is used in pyrotechnic flares to provide a distinctive green color, and in rockets as an igniter.
By far the most commercially important boron compound in terms of dollar sales is Na2B4O7 • 5H2O. This pentahydrate is used in very large quantities in the manufacture of insulation fiberglass and sodium perborate bleach.
Boric acid is also an important boron compound with major markets in textile products. Use of borax as a mild antiseptic is minor in economical terms. Boron compounds are also extensively used in the manufacture of borosilicate glasses. Other boron compounds show promise in treating arthritis.
The isotope boron-10 is used as a control for nuclear reactors, as a shield for nuclear radiation, and in instruments used for detecting neutrons. Boron nitride has remarkable properties and can be used to make a material as hard as diamond. The nitride also behaves like an electrical insulator but conducts heat like a metal.
Boron also has lubricating properties similar to graphite. The hydrides are easily oxidized with considerable energy liberation, and have been studied for use as rocket fuels. Demand is increasing for boron filaments, a high-strength, lightweight material chiefly employed for advanced aerospace structures.
Boron is similar to carbon in that it has a capacity to form stable covalently bonded molecular networks. Carbonates, metalloboranes, phosphacarboranes, and other families comprise thousands of compounds.
Isotopes in Earth/Planetary Science
Molecules, atoms, and ions of the stable isotopes of boron possess slightly different physical and chemical properties, and they commonly will be fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in atomic weights. Natural terrestrial materials show a substantial variation in boron isotopic abundance (Fig. IUPAC.5.1). The relative abundances of 10B and 11B have been used in a variety of environmental tracer applications [51] A. Vengosh, K. G. Heumann, S. Jaraske, R. Kasher. Environ. Sci. Technol.28, 1968 (1994)., [52] A. Vengosh. Biol. Trace Elem. Res.66, 145 (1998).. The isotope-amount ratio n(11B)/n(10B) of boron in a water sample depends on the source of the water and region through which the water flows, and it may also be affected by some types of contamination, such as dissolved borate in domestic wastewater. Different water sources may have their own distinct boron isotopic composition, e.g. seawater versus water from continental sources (Fig. IUPAC.5.1).
Isotopes in Industry
The large value of the absorption cross section of 10B for thermal neutrons makes this isotope useful for counting neutrons. 10B is being studied as a potential replacement for 3He in radiation detectors [32] G. V. Jean. Advancing Hidden Nuclear Material Detection, National Defense Industrial Association (2014), Feb. 28; http://www.nationaldefensemagazine.org/archive/2010/December/Pages/AdvancingHiddenNuclearMaterialDetection.aspx., [53] L. Foulke. Director of Nuclear Education Outreach, University of Pittsburgh. Introduction to Reactivity and Reactor Control, IAEA Workshop on Desktop Simulation (2014), Feb. 22; http://www.iaea.org/NuclearPower/Downloadable/Meetings/2011/2011-10-03-10-14-WS-NPTD/Foulke.1-Introduction.Reactivity.pdf., [54] P. Frame. Boron Trifluoride (BF3) Neutron Detectors, Oak Ridge Associated Universities (2014), Feb. 22; http://www.orau.org/PTP/collection/proportional%20counters/bf3info.htm.. The large thermal absorption cross section of 10B makes the isotope useful in control rods (Fig. IUPAC.5.2) [55] United States Nuclear Regulatory Commission. Pressurized Water Reactors, U.S. Nuclear Regulatory Commission (2014), Feb. 22; http://www.nrc.gov/reactors/pwrs.html..
Isotopes in Medicine
10B has a high thermal neutron absorption cross section and can readily absorb neutrons via the reaction 10B+n→ 7Li+α. The alpha particles resulting from this reaction carry away a relatively large kinetic energy and are useful for the treatment of malignant tumors in cancer patients [56] D. Gabel. Radiother Oncol.30, 199 (1994)., [57] D. N. Slatkin. Neutron News1, 25 (1990)., [58] R. F. Barth, J. A. Coderre, M. C. G. Vicente, T. E. Blue. Clin. Cancer Res.11, 3987 (2005)..
Boron commonly shows the +3 oxidation state, but its bonding is often better described by electron-deficient multicenter structures. Boric acid, H₃BO₃, is a weak Lewis acid in water and a precursor to many borates. Borax, Na₂B₄O₇·10H₂O, is a major industrial borate. Boron trioxide, B₂O₃, is a glass-forming oxide. Boron trifluoride, BF₃, is a strong Lewis acid used in synthesis, while diborane, B₂H₆, illustrates boron hydride cluster chemistry. Boron nitride, BN, occurs in graphite-like and diamond-like forms with useful thermal and mechanical properties.
See more information at the Boron compound page.
Elemental boron is not highly toxic in compact form, but fine powders can irritate eyes, skin, and the respiratory tract and may be combustible under some conditions. Soluble borates and boric acid, H₃BO₃, can be harmful at sufficient dose, especially with repeated or high exposure. Boron trifluoride, BF₃, and diborane, B₂H₆, are far more hazardous: the former is corrosive and toxic, and the latter is toxic and flammable. Neutron-absorbing ¹⁰B is stable and is not itself radioactive.
Elemental boron and the borates are not considered to be toxic, and they do not require special care in handling. However, some of the more exotic boron hydrogen compounds are definitely toxic and do require care.
Boron is a natural trace element in rocks, soils, seawater, geothermal waters, and evaporite deposits. Weathering releases borate species that are mobile in water, especially under neutral to alkaline conditions. It is an essential micronutrient for higher plants, but the margin between deficiency and toxicity can be narrow in sensitive crops. Natural and industrial sources include volcanic emissions, seawater aerosols, mining, glass manufacture, detergents, and irrigation return flows.
Boron is supplied almost entirely from borate minerals and boron-rich brines, not from mining elemental boron. Major commercial materials include borax, kernite, ulexite, and colemanite, which are refined into boric acid, H₃BO₃, borax, Na₂B₄O₇·10H₂O, and other borates. Demand is led by glass, fiberglass, ceramics, detergents, agriculture, and specialty chemical uses. High-purity elemental boron and isotopically enriched ¹⁰B are much smaller specialty markets, with enrichment adding significant cost. Recycling is limited because boron is often dispersed in glass, ceramics, or formulations.
The element is not found free in nature, but occurs as orthoboric acid usually found in certain volcanic spring waters and as borates in boron and colemantie.
Important sources of boron are ore rasorite (kernite) and tincal (borax ore). Both of these ores are found in the Mojave Desert. Tincal is the most important source of boron from the Mojave. Extensive borax deposits are also found in Turkey.
Boron exists naturally as 19.78% 10B isotope and 80.22% 11B isotope. High-purity crystalline boron may be prepared by the vapor phase reduction of boron trichloride or tribromide with hydrogen on electrically heated filaments. The impure or amorphous, boron, a brownish-black powder, can be obtained by heating the trioxide with magnesium powder.
Boron of 99.9999% purity has been produced and is available commercially. Elemental boron has an energy band gap of 1.50 to 1.56 eV, which is higher than that of either silicon or germanium.
Boron is rare in the universe compared with neighboring light elements. It is not made efficiently by ordinary stellar fusion and is readily destroyed at stellar interior temperatures. Most cosmic boron is attributed to spallation reactions in which cosmic rays fragment heavier nuclei such as carbon, nitrogen, and oxygen. In the Solar System it is concentrated mainly in crustal and evaporitic materials rather than metallic or volatile reservoirs.
- Natural boron is mainly a mixture of ¹⁰B and ¹¹B.
- The large neutron-capture cross section of ¹⁰B gives boron unusual nuclear importance for a light element.
- Many crystalline boron structures are based on B₁₂ icosahedra rather than simple close packing.
- Boron deficiency and boron toxicity can both occur in agriculture.
- Borosilicate glass resists thermal shock partly because boron lowers thermal expansion.
- Boron carbide, B₄C, is one of the hardest widely used ceramic materials.
Images
Propriétés
Propriétés physiques
- Rayon atomique (empirique)
- 85 pm Comparer : Rayon atomique (empirique) de tous les éléments →
- Rayon covalent
- 84 pm Comparer : Rayon covalent de tous les éléments →
- Rayon de van der Waals
- 192 pm Comparer : Rayon de van der Waals de tous les éléments →
- Rayon métallique
- 80 pm Comparer : Rayon métallique de tous les éléments →
- Masse volumique
- 2370 kg/m³ Comparer : Masse volumique de tous les éléments →
- Volume molaire
- 0,0046 L/mol
- Phase aux CNTP
- Solide Comparer : Phase aux CNTP de tous les éléments →
- Point de fusion
- 2074,85 °C Comparer : Point de fusion de tous les éléments →
- Point d’ébullition
- 3999,85 °C Comparer : Point d’ébullition de tous les éléments →
- Conductivité thermique
- 27,4 W/(m·K) Comparer : Conductivité thermique de tous les éléments →
- Capacité thermique massique
- 1,026 J/(g·K) Comparer : Capacité thermique massique de tous les éléments →
- Capacité thermique molaire
- 11,087 J/(mol·K) Comparer : Capacité thermique molaire de tous les éléments →
- Structure cristalline
- Quadratique Comparer : Structure cristalline de tous les éléments →
Propriétés chimiques
- Électronégativité (Pauling)
- 2,04 Comparer : Électronégativité (Pauling) de tous les éléments →
- Électronégativité (Allen)
- 2,051
- Affinité électronique
- 0,27972 eV
- Énergie d’ionisation (1re)
- 8,298019 eV Comparer : Énergie d’ionisation (1re) de tous les éléments →
- Énergie d’ionisation (2e)
- 25,154917 eV Comparer : Énergie d’ionisation (2e) de tous les éléments →
- Énergie d’ionisation (3e)
- 37,930721 eV Comparer : Énergie d’ionisation (3e) de tous les éléments →
- Énergie d’ionisation (4e)
- 259,375272 eV Comparer : Énergie d’ionisation (4e) de tous les éléments →
- Énergie d’ionisation (5e)
- 340,227194 eV Comparer : Énergie d’ionisation (5e) de tous les éléments →
- États d’oxydation
- −5, −1, 0, +1, +2, +3 Comparer : États d’oxydation de tous les éléments →
- Électrons de valence
- 3 Comparer : Électrons de valence de tous les éléments →
- Configuration électronique
- [He] 2s2 2p1
Propriétés thermodynamiques
- Enthalpie de fusion
- 0,52028813 eV Comparer : Enthalpie de fusion de tous les éléments →
- Enthalpie de vaporisation
- 4,974867 eV Comparer : Enthalpie de vaporisation de tous les éléments →
- Enthalpie de sublimation
- 5,855833 eV
- Enthalpie d’atomisation
- 5,855833 eV
- Enthalpie d’atomisation
- 5,855833 eV
Propriétés nucléaires
- Protons
- 5 Comparer : Protons de tous les éléments →
- Neutrons
- 6 Comparer : Neutrons de tous les éléments →
- Isotopes connus
- 16 Comparer : Isotopes connus de tous les éléments →
- Isotopes stables
- 2 Comparer : Isotopes stables de tous les éléments →
- Isotope le plus stable
- B-11
- Année de découverte
- 1808
Abondance
- Abondance (croûte terrestre)
- 10 mg/kg Comparer : Abondance (croûte terrestre) de tous les éléments →
- Abondance (océan)
- 4,44 mg/L Comparer : Abondance (océan) de tous les éléments →
Structure cristalline
- Paramètre de maille a
- 873 pm
Structure électronique
- Électrons par couche
- 2, 3 Comparer : Électrons par couche de tous les éléments →
Identifiants
- Numéro CAS
- 7440-42-8 Comparer : Numéro CAS de tous les éléments →
- Symbole de terme
- 2P°1/2
- InChI
- InChI=1S/B
- Clé InChI
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N
Configuration électronique Mesuré
B: 2s² 2p¹[He] 2s² 2p¹1s² 2s² 2p¹Modèle atomique
Les isotopes diffèrent par leur nombre de neutrons, leur masse et leur stabilité — pas par la configuration électronique de l’atome neutre.
Modèle atomique schématique, non à l’échelle.
Empreinte atomique
Spectre d’émission / d’absorption
Distribution isotopique
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie |
|---|---|---|---|
| 10 Stable | 10,01293695 ± 0,00000041 | 19,9000% | Stable |
| 11 Stable | 11,00930536 ± 0,00000045 | 80,1000% | Stable |
Phase / État
Explication: 2049,8 °C en dessous du point de fusion (2074,85 °C)
Schématique, non à l’échelle
Points de transition de phase
Énergies de transition
Énergie nécessaire pour faire fondre 1 mol au point de fusion
Énergie nécessaire pour vaporiser 1 mol au point d’ébullition
Énergie nécessaire pour sublimer 1 mol au point de sublimation
Masse volumique
Dans les conditions standard
Dans les conditions standard
Spectres atomiques
Raies répertoriées ?
| Ion | Charge | Nombre total de raies | Probabilités de transition | Désignations des niveaux |
|---|---|---|---|---|
| B I | 0 | 371 | 269 | 371 |
| 11B I Isotope | 0 | 53 | 0 | 53 |
| 10B I Isotope | 0 | 11 | 0 | 11 |
| B II | +1 | 592 | 435 | 592 |
| 10B II Isotope | +1 | 9 | 0 | 9 |
| 11B II Isotope | +1 | 9 | 0 | 9 |
| B III | +2 | 390 | 106 | 390 |
| B IV | +3 | 478 | 234 | 478 |
| B V | +4 | 258 | 240 | 258 |
Niveaux répertoriés ?
| Ion | Charge | Niveaux |
|---|---|---|
| B I | 0 | 125 |
| 11B I Isotope | 0 | 69 |
| 10B I Isotope | 0 | 29 |
| B II | +1 | 157 |
| 10B II Isotope | +1 | 10 |
| 11B II Isotope | +1 | 10 |
| B III | +2 | 150 |
| B IV | +3 | 174 |
| B V | +4 | 101 |
Rayons ioniques
| Charge | Coordinence | Spin | Rayon |
|---|---|---|---|
| +3 | 3 | N/D | 1 pm |
| +3 | 4 | N/D | 11 pm |
| +3 | 6 | N/D | 27 pm |
Composés
Isotopes (2)
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie | Mode de désintégration | |
|---|---|---|---|---|---|
| 10 Stable | 10,01293695 ± 0,00000041 | 19,9000% ± 0,7000% | Stable | stable | |
| 11 Stable | 11,00930536 ± 0,00000045 | 80,1000% ± 0,7000% | Stable | stable |
Raies spectrales
| Longueur d’onde (nm) | Intensité | Degré d’ionisation | Type | Transition | Précision | Source | |
|---|---|---|---|---|---|---|---|
| 391.482 nm | N/D | B II | emission | 1s2.2s.2p 1P* → 1s2.2p2 3P | Mesurée | NIST | |
| 391.687 nm | N/D | B II | emission | 1s2.2s.2p 1P* → 1s2.2p2 3P | Mesurée | NIST | |
| 391.817 nm | N/D | B II | emission | 1s2.2s.2p 1P* → 1s2.2p2 3P | Mesurée | NIST | |
| 394.447 nm | N/D | B II | emission | 1s2.2p.3d 3F* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 394.587 nm | N/D | B II | emission | 1s2.2p.3d 3F* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 394.82 nm | N/D | B II | emission | 1s2.2p.3d 3F* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 395.038 nm | 18 | B II | emission | 1s2.2p.3d 1D* → 1s2.2p.4f 1F | Mesurée | NIST | |
| 395.1698 nm | N/D | B II | emission | 1s2.2p2 1D → 1s2.2p2 1S | Mesurée | NIST | |
| 399.024 nm | 70 | B II | emission | 1s2.2s.4p 1P* → 1s2.2s.8d 1D | Mesurée | NIST | |
| 400.017 nm | 136 | B III | emission | 1s.2s.(3S).4d 4D → 1s.2s.(3S).5f 4F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 412.1928 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4f 3F* | Mesurée | NIST | |
| 414.697 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.8f 2F* | Mesurée | NIST | |
| 414.708 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.8f 2F* | Mesurée | NIST | |
| 414.708 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.8f 2F* | Mesurée | NIST | |
| 415.284 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 415.284 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 415.471 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 415.471 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 415.471 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 415.584 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 417.896 nm | N/D | B I | emission | 2s2.3p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 417.927 nm | N/D | B I | emission | 2s2.3p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 418.099 nm | N/D | B I | emission | 2s2.3p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 418.13 nm | N/D | B I | emission | 2s2.3p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 419.4792 nm | 180 | B II | emission | 1s2.2s.3p 1P* → 1s2.2s.4s 1S | Mesurée | NIST | |
| 419.773 nm | 30 | B IV | emission | 1s.5s 3S → 1s.6p 3P* | Mesurée | NIST | |
| 424.3 nm | 300 | B III | emission | 1s2.4p 2P* → 1s2.5d 2D | Mesurée | NIST | |
| 424.359 nm | N/D | B III | emission | 1s2.4p 2P* → 1s2.5d 2D | Mesurée | NIST | |
| 424.37 nm | N/D | B III | emission | 1s2.4p 2P* → 1s2.5d 2D | Mesurée | NIST | |
| 427.274 nm | 50 | B II | emission | 1s2.2s.4s 3S → 1s2.2s.6p 3P* | Mesurée | NIST | |
| 429.571 nm | 50 | B II | emission | 1s2.2s.4p 1P* → 1s2.2s.7d 1D | Mesurée | NIST | |
| 436.147 nm | 60 | B III | emission | 1s.2p.(3P*).4f 2F → 1s.2p.(3P*).5g 2G* | Mesurée | NIST | |
| 436.61 nm | 100 | B III | emission | 1s.2p.(3P*).4f 4F → 1s.2p.(3P*).5g 4G* | Mesurée | NIST | |
| 443.11 nm | N/D | B II | emission | 1s2.2p.3d 3D* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 443.185 nm | N/D | B II | emission | 1s2.2p.3d 3D* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 443.291 nm | N/D | B II | emission | 1s2.2p.3d 3D* → 1s2.2p.4f 3F | Mesurée | NIST | |
| 445.943 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6d 3D | Mesurée | NIST | |
| 445.943 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6d 3D | Mesurée | NIST | |
| 445.943 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6d 3D | Mesurée | NIST | |
| 447.112 nm | N/D | B III | emission | 1s2.5s 2S → 1s2.7p 2P* | Mesurée | NIST | |
| 447.112 nm | N/D | B III | emission | 1s2.5s 2S → 1s2.7p 2P* | Mesurée | NIST | |
| 447.2029 nm | N/D | B II | emission | 1s2.2s.3p 3P* → 1s2.2s.4s 3S | Mesurée | NIST | |
| 447.2151 nm | N/D | B II | emission | 1s2.2s.3p 3P* → 1s2.2s.4s 3S | Mesurée | NIST | |
| 447.2862 nm | 470 | B II | emission | 1s2.2s.3p 3P* → 1s2.2s.4s 3S | Mesurée | NIST | |
| 448.692 nm | N/D | B III | emission | 1s2.4d 2D → 1s2.5f 2F* | Mesurée | NIST | |
| 448.71 nm | N/D | B III | emission | 1s2.4d 2D → 1s2.5f 2F* | Mesurée | NIST | |
| 449.09 nm | 20 | B IV | emission | 1s.2s 1S → 1s.2p 1P* | Mesurée | NIST | |
| 449.773 nm | 1700 | B III | emission | 1s2.4f 2F* → 1s2.5g 2G | Mesurée | NIST | |
| 449.853 nm | N/D | B III | emission | 1s2.4f 2F* → 1s2.5f 2F* | Mesurée | NIST | |
| 449.859 nm | N/D | B III | emission | 1s2.4f 2F* → 1s2.5f 2F* | Mesurée | NIST | |
| 450.481 nm | N/D | B III | emission | 1s2.4f 2F* → 1s2.5d 2D | Mesurée | NIST | |
| 450.482 nm | N/D | B III | emission | 1s2.4f 2F* → 1s2.5d 2D | Mesurée | NIST | |
| 451.9912773 nm | N/D | B V | emission | 7i 2I → 9k 2K* | Mesurée | NIST | |
| 451.9946377 nm | N/D | B V | emission | 7i 2I → 9k 2K* | Mesurée | NIST | |
| 453.229 nm | N/D | B II | emission | 1s2.2s.4f 1F* → 1s2.2p.3p 1D | Mesurée | NIST | |
| 459.72 nm | N/D | B III | emission | 1s.2s.(3S).4d 4D → 1s.2s.(3S).5p 4P* | Mesurée | NIST | |
| 459.73 nm | N/D | B III | emission | 1s.2p.(3P*).4p 4P → 1s.2p.(3P*).5s 4P* | Mesurée | NIST | |
| 461.114 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3S | Mesurée | NIST | |
| 461.114 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3S | Mesurée | NIST | |
| 461.114 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2p.3p 3S | Mesurée | NIST | |
| 461.32 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6p 1P* | Mesurée | NIST | |
| 463.217 nm | N/D | B III | emission | 1s2.4d 2D → 1s2.5p 2P* | Mesurée | NIST | |
| 463.243 nm | N/D | B III | emission | 1s2.4d 2D → 1s2.5p 2P* | Mesurée | NIST | |
| 463.263 nm | N/D | B III | emission | 1s2.4d 2D → 1s2.5p 2P* | Mesurée | NIST | |
| 464.69 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 1F* | Mesurée | NIST | |
| 464.69 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 1F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 464.701 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6f 3F* | Mesurée | NIST | |
| 465.58 nm | N/D | B IV | emission | 1s.5d 1D → 1s.6f 1F* | Mesurée | NIST | |
| 465.786 nm | N/D | B IV | emission | 1s.5f 3F* → 1s.6g 3G | Mesurée | NIST | |
| 465.786 nm | N/D | B IV | emission | 1s.5f 3F* → 1s.6g 3G | Mesurée | NIST | |
| 465.786 nm | N/D | B IV | emission | 1s.5f 3F* → 1s.6g 3G | Mesurée | NIST | |
| 465.8 nm | N/D | B IV | emission | 1s.5f 1F* → 1s.6g 3G | Mesurée | NIST | |
| 465.815 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6h 3H* | Mesurée | NIST | |
| 465.815 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6h 3H* | Mesurée | NIST | |
| 465.815 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6h 3H* | Mesurée | NIST | |
| 465.815 nm | N/D | B IV | emission | 1s.5g 1G → 1s.6h 3H* | Mesurée | NIST | |
| 465.92 nm | N/D | B IV | emission | 1s.5g 1G → 1s.6f 1F* | Mesurée | NIST | |
| 465.92 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6f 1F* | Mesurée | NIST | |
| 465.92 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6f 1F* | Mesurée | NIST | |
| 465.927 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6f 3F* | Mesurée | NIST | |
| 465.927 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6f 3F* | Mesurée | NIST | |
| 465.927 nm | N/D | B IV | emission | 1s.5g 3G → 1s.6f 3F* | Mesurée | NIST | |
| 465.927 nm | N/D | B IV | emission | 1s.5g 1G → 1s.6f 3F* | Mesurée | NIST | |
| 468.31 nm | N/D | B IV | emission | 1s.5p 1P* → 1s.6p 1P* | Mesurée | NIST | |
| 468.481 nm | N/D | B IV | emission | 1s.6g 3G → 1s.8h 3H* | Mesurée | NIST | |
| 468.489 nm | N/D | B IV | emission | 1s.6f 3F* → 1s.8g 3G | Mesurée | NIST | |
| 468.489 nm | N/D | B IV | emission | 1s.6f 3F* → 1s.8g 3G | Mesurée | NIST | |
| 468.489 nm | N/D | B IV | emission | 1s.6f 3F* → 1s.8g 3G | Mesurée | NIST | |
| 468.5 nm | N/D | B IV | emission | 1s.6h 3H* → 1s.8i 3I | Mesurée | NIST | |
| 471.612 nm | 15 | B II | emission | 1s2.2p.3d 1D* → 1s2.2p.4p 1P | Mesurée | NIST | |
| 471.99 nm | N/D | B IV | emission | 1s.5p 1P* → 1s.6d 1D | Mesurée | NIST | |
| 477.384 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6p 3P* | Mesurée | NIST | |
| 477.384 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6p 3P* | Mesurée | NIST | |
| 477.384 nm | N/D | B IV | emission | 1s.5d 3D → 1s.6p 3P* | Mesurée | NIST | |
| 478.42 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 478.42 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 478.4203 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 478.4203 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 478.4203 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 478.4203 nm | N/D | B II | emission | 1s2.2s.3d 3D → 1s2.2s.4p 3P* | Mesurée | NIST | |
| 481.276 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6s 3S | Mesurée | NIST | |
| 481.276 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6s 3S | Mesurée | NIST | |
| 481.276 nm | N/D | B IV | emission | 1s.5p 3P* → 1s.6s 3S | Mesurée | NIST | |
| 491.746 nm | 500 | B III | emission | 1s2.4p 2P* → 1s2.5s 2S | Mesurée | NIST | |
| 491.84 nm | 500 | B III | emission | 1s2.4p 2P* → 1s2.5s 2S | Mesurée | NIST | |
| 494.0365 nm | 440 | B II | emission | 1s2.2s.3d 1D → 1s2.2s.4f 1F* | Mesurée | NIST | |
| 494.4788284 nm | N/D | B V | emission | 6h 2H* → 7i 2I | Mesurée | NIST | |
| 494.4864305 nm | N/D | B V | emission | 6h 2H* → 7i 2I | Mesurée | NIST | |
| 498.848 nm | N/D | B III | emission | 1s2.5p 2P* → 1s2.7d 2D | Mesurée | NIST | |
| 498.901 nm | N/D | B III | emission | 1s2.5p 2P* → 1s2.7d 2D | Mesurée | NIST | |
| 512.579 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.7f 3F* | Mesurée | NIST | |
| 512.579 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.7f 3F* | Mesurée | NIST | |
| 512.579 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.7f 3F* | Mesurée | NIST | |
| 515.776 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.7f 2F* | Mesurée | NIST | |
| 515.793 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.7f 2F* | Mesurée | NIST | |
| 516.57 nm | N/D | B III | emission | 1s2.5f 2F* → 1s2.7g 2G | Mesurée | NIST | |
| 516.579 nm | N/D | B III | emission | 1s2.5f 2F* → 1s2.7g 2G | Mesurée | NIST | |
| 522.65 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.7p 2P* | Mesurée | NIST | |
| 522.65 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.7p 2P* | Mesurée | NIST | |
| 522.667 nm | N/D | B III | emission | 1s2.5d 2D → 1s2.7p 2P* | Mesurée | NIST | |
| 526.311 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.7g 3G | Mesurée | NIST | |
| 526.311 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.7g 3G | Mesurée | NIST | |
| 526.311 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.7g 3G | Mesurée | NIST | |
| 529.28 nm | N/D | B III | emission | 1s2.5p 2P* → 1s2.7s 2S | Mesurée | NIST | |
| 529.34 nm | N/D | B III | emission | 1s2.5p 2P* → 1s2.7s 2S | Mesurée | NIST | |
| 534.765 nm | 15 | B II | emission | 1s2.2s.4s 1S → 1s2.2p.3s 1P* | Mesurée | NIST | |
| 539.322 nm | 30 | B II | emission | 1s2.2s.4p 1P* → 1s2.2p.3p 1P | Mesurée | NIST | |
| 550.4527 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.11f 2F* | Mesurée | NIST | |
| 550.4622 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.11f 2F* | Mesurée | NIST | |
| 556.3146 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.10f 2F* | Mesurée | NIST | |
| 556.3244 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.10f 2F* | Mesurée | NIST | |
| 563.30717 nm | N/D | B I | emission | 2s2.3s 2S → 2s2.4p 2P* | Mesurée | NIST | |
| 563.32732 nm | N/D | B I | emission | 2s2.3s 2S → 2s2.4p 2P* | Mesurée | NIST | |
| 564.4278 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.9f 2F* | Mesurée | NIST | |
| 564.4379 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.9f 2F* | Mesurée | NIST | |
| 576.1901 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.8f 2F* | Mesurée | NIST | |
| 576.1901 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.8f 2F* | Mesurée | NIST | |
| 576.2006 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.8f 2F* | Mesurée | NIST | |
| 578.747 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2s.5p 3P* | Mesurée | NIST | |
| 578.747 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2s.5p 3P* | Mesurée | NIST | |
| 578.747 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2s.5p 3P* | Mesurée | NIST | |
| 581.833 nm | 60 | B I | emission | 2s.2p2 2P → 2s.2p.(3P*).3d 2D* | Mesurée | NIST | |
| 582.116 nm | 100 | B I | emission | 2s.2p2 2P → 2s.2p.(3P*).3d 2D* | Mesurée | NIST | |
| 582.228 nm | 10 | B I | emission | 2s.2p2 2P → 2s.2p.(3P*).3d 2D* | Mesurée | NIST | |
| 594.2619 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.7f 2F* | Mesurée | NIST | |
| 594.2619 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.7f 2F* | Mesurée | NIST | |
| 594.2731 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.7f 2F* | Mesurée | NIST | |
| 601.35 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2s.6s 3S | Mesurée | NIST | |
| 601.35 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2s.6s 3S | Mesurée | NIST | |
| 601.35 nm | N/D | B II | emission | 1s2.2s.4p 3P* → 1s2.2s.6s 3S | Mesurée | NIST | |
| 602.772 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.8d 2D | Mesurée | NIST | |
| 602.837 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.8d 2D | Mesurée | NIST | |
| 602.837 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.8d 2D | Mesurée | NIST | |
| 608.039 nm | 85 | B II | emission | 1s2.2p2 1S → 1s2.2s.3p 1P* | Mesurée | NIST | |
| 612.224 nm | N/D | B II | emission | 1s2.2p2 1S → 1s2.2s.3p 3P* | Mesurée | NIST | |
| 612.508 nm | 93 | B III | emission | 1s.2s.(3S).3s 4S → 1s.2s.(3S).3p 4P* | Mesurée | NIST | |
| 612.752 nm | N/D | B III | emission | 1s.2s.(3S).3s 4S → 1s.2s.(3S).3p 4P* | Mesurée | NIST | |
| 612.797 nm | N/D | B III | emission | 1s.2s.(3S).3s 4S → 1s.2s.(3S).3p 4P* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 614.891 nm | N/D | B II | emission | 1s2.2s.4d 3D → 1s2.2s.6f 3F* | Mesurée | NIST | |
| 617.867 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.8s 2S | Mesurée | NIST | |
| 617.936 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.8s 2S | Mesurée | NIST | |
| 618.638 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 618.638 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 618.638 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 619.359 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 619.359 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 619.735 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2p.3p 3D | Mesurée | NIST | |
| 622.745 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.7d 2D | Mesurée | NIST | |
| 622.815 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.7d 2D | Mesurée | NIST | |
| 622.815 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.7d 2D | Mesurée | NIST | |
| 624.4557 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.6f 2F* | Mesurée | NIST | |
| 624.4557 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.6f 2F* | Mesurée | NIST | |
| 624.4681 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.6f 2F* | Mesurée | NIST | |
| 628.551 nm | 30 | B II | emission | 1s2.2s.3d 1D → 1s2.2s.4p 1P* | Mesurée | NIST | |
| 634.927 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.6g 3G | Mesurée | NIST | |
| 634.927 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.6g 3G | Mesurée | NIST | |
| 634.927 nm | N/D | B II | emission | 1s2.2s.4f 3F* → 1s2.2s.6g 3G | Mesurée | NIST | |
| 635.676 nm | 1 | B II | emission | 1s2.2s.4f 1F* → 1s2.2s.6g 1G | Mesurée | NIST | |
| 643.151 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.7s 2S | Mesurée | NIST | |
| 643.225 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.7s 2S | Mesurée | NIST | |
| 652.056 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2p.3s 3P* | Mesurée | NIST | |
| 652.959 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2p.3s 3P* | Mesurée | NIST | |
| 653.371 nm | N/D | B II | emission | 1s2.2s.4s 3S → 1s2.2p.3s 3P* | Mesurée | NIST | |
| 656.269 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.6d 2D | Mesurée | NIST | |
| 656.345 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.6d 2D | Mesurée | NIST | |
| 656.345 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.6d 2D | Mesurée | NIST | |
| 657.112 nm | 0.5 | B II | emission | 1s2.2s.5p 1P* → 1s2.2p.3p 1D | Mesurée | NIST | |
| 671.765 nm | 0.5 | B II | emission | 1s2.2s.4d 1D → 1s2.2s.6f 1F* | Mesurée | NIST | |
| 677.866 nm | N/D | B I | emission | 2s2.4p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 677.895 nm | N/D | B I | emission | 2s2.4p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 678.401 nm | N/D | B I | emission | 2s2.4p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 678.431 nm | N/D | B I | emission | 2s2.4p 2P* → 2s.2p2 2P | Mesurée | NIST | |
| 678.614 nm | 0.5 | B II | emission | 1s2.2s.4p 1P* → 1s2.2s.5d 1D | Mesurée | NIST | |
| 681.95167 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.5f 2F* | Mesurée | NIST | |
| 681.95167 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.5f 2F* | Mesurée | NIST | |
| 681.96637 nm | N/D | B I | emission | 2s.2p2 2D → 2s2.5f 2F* | Mesurée | NIST | |
| 697.688 nm | N/D | B II | emission | 1s2.2s.3s 3S → 1s2.2s.3p 1P* | Mesurée | NIST | |
| 703.027 nm | 4 | B II | emission | 1s2.2s.3s 3S → 1s2.2s.3p 3P* | Mesurée | NIST | |
| 703.203 nm | 3 | B II | emission | 1s2.2s.3s 3S → 1s2.2s.3p 3P* | Mesurée | NIST | |
| 703.233 nm | 2 | B II | emission | 1s2.2s.3s 3S → 1s2.2s.3p 3P* | Mesurée | NIST | |
| 715.955 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 716.016 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 716.511 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 716.846 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 717.045 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 717.602 nm | N/D | B II | emission | 1s2.2p.3s 3P* → 1s2.2p.3p 3P | Mesurée | NIST | |
| 720.593 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.5d 2D | Mesurée | NIST | |
| 720.685 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.5d 2D | Mesurée | NIST | |
| 720.685 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.5d 2D | Mesurée | NIST | |
| 720.766 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.6s 2S | Mesurée | NIST | |
| 720.859 nm | N/D | B I | emission | 2s2.3p 2P* → 2s2.6s 2S | Mesurée | NIST | |
| 722.85 nm | N/D | B II | emission | 1s2.2s.4s 1S → 1s2.2s.5p 1P* | Mesurée | NIST |
Propriétés étendues
Rayons covalents (données étendues)
- Rayon covalent (Pyykkö)
- 85 pm
- Rayon covalent (Pyykkö, liaison double)
- 78 pm
- Rayon covalent (Pyykkö, liaison triple)
- 73 pm
Rayons de van der Waals
- Truhlar
- 192 pm
- Batsanov
- 180 pm
- Alvarez
- 191 pm
- UFF
- 408,3 pm
- MM3
- 215 pm
- Dreiding
- 402 pm
Rayons atomiques et métalliques
- Rayon atomique (Rahm)
- 205 pm
- Rayon métallique (C12)
- 98 pm
Échelles de numérotation
- Mendeleev
- 81
- Pettifor
- 86
- Glawe
- 86
Échelles d’électronégativité
- Ghosh
- 0
- Miedema
- 5
- Gunnarsson–Lundqvist
- 4
- Robles–Bartolotti
- 4
Polarisabilité et dispersion
- Polarisabilité dipolaire
- 20,5 a.u.
- Polarisabilité dipolaire (incertitude)
- 0,1 a.u.
- C₆
- 99,5 Ha·Bohr6
- C₆ (Gould–Bučko)
- 99,2 Ha·Bohr6
Paramètres de Miedema
- Volume molaire de Miedema
- 4,7 cm3/mol
- Densité électronique de Miedema
- 5
Risque d’approvisionnement et économie
- Concentration de la production
- 34
- Risque relatif d’approvisionnement
- 5
- Stabilité politique (principal producteur)
- 12
- Stabilité politique (principal détenteur de réserves)
- 12
Transitions de phase et allotropes
| Point de fusion | 2350,15 K |
| Point d’ébullition | 4273,15 K |
Catégories d’états d’oxydation
Données de référence avancées
Constantes d’écran (3)
| n | Orbitale | σ |
|---|---|---|
| 1 | s | 0,3205 |
| 2 | p | 2,5786 |
| 2 | s | 2,4238 |
Détail des rayons cristallins (3)
| Charge | CN | Spin | rcrystal (pm) | Origine |
|---|---|---|---|---|
| 3 | III | 15 | ||
| 3 | IV | 25 | ||
| 3 | VI | 41 | calculated, |
Modes de désintégration des isotopes (30)
| Isotope | Mode | Intensité |
|---|---|---|
| 6 | 2p | — |
| 7 | p | 100% |
| 8 | B+ | 100% |
| 8 | B+A | 100% |
| 9 | p | 100% |
| 12 | B- | 100% |
| 12 | B-A | 0,6% |
| 13 | B- | 100% |
| 13 | B-n | 0,3% |
| 14 | B- | 100% |
Facteurs de diffusion des rayons X (502)
| Énergie (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 1,48933 |
| 10,1617 | — | 1,48084 |
| 10,3261 | — | 1,4724 |
| 10,4931 | — | 1,46401 |
| 10,6628 | — | 1,45567 |
| 10,8353 | — | 1,44738 |
| 11,0106 | — | 1,43913 |
| 11,1886 | — | 1,43093 |
| 11,3696 | — | 1,42278 |
| 11,5535 | — | 1,41467 |
Données complémentaires
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
1.0×101 milligrams per kilogram
Références (1)
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
4.44 milligrams per liter
Références (1)
Sources
Sources of this element.
The element is not found free in nature, but occurs as orthoboric acid usually found in certain volcanic spring waters and as borates in boron and colemantie.
Important sources of boron are ore rasorite (kernite) and tincal (borax ore). Both of these ores are found in the Mojave Desert. Tincal is the most important source of boron from the Mojave. Extensive borax deposits are also found in Turkey.
Boron exists naturally as 19.78% 10B isotope and 80.22% 11B isotope. High-purity crystalline boron may be prepared by the vapor phase reduction of boron trichloride or tribromide with hydrogen on electrically heated filaments. The impure or amorphous, boron, a brownish-black powder, can be obtained by heating the trioxide with magnesium powder.
Boron of 99.9999% purity has been produced and is available commercially. Elemental boron has an energy band gap of 1.50 to 1.56 eV, which is higher than that of either silicon or germanium.
Références (1)
- [6] Boron https://periodic.lanl.gov/5.shtml
Références
(9)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of 17 national laboratories funded by the U.S. Department of Energy. The lab's primary mission is to conduct basic research of the atom's nucleus using the lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF). For more information visit https://www.jlab.org/
The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
The periodic table contains NIST's critically-evaluated data on atomic properties of the elements. The provenance data that include data for atomic spectroscopy, X-ray and gamma ray, radiation dosimetry, nuclear physics, and condensed matter physics may be found from the link under the source name. Ref: https://www.nist.gov/pml/atomic-spectra-database
This section provides all form of data related to element Boron.
The element property data was retrieved from publications.