Magnesium (Mg)
alkaline-earth-metalSolid
Masse atomique relative standard
24,305 u [24,304, 24,307]Configuration électronique
[Ne] 3s2Point de fusion
649,85 °CPoint d’ébullition
1089,85 °CMasse volumique
1740 kg/m³États d’oxydation
0, +1, +2Électronégativité (Pauling)
1,31Énergie d’ionisation (1re)
7,646236 eVAnnée de découverte
1755Rayon atomique
150 pmDétails
Magnesium is a light alkaline earth metal and a major rock-forming element. It occurs in silicate minerals, carbonates, evaporites, seawater, and brines, almost entirely as Mg²⁺ rather than as native metal. Its low density, ready formation of stable salts, and high affinity for oxygen shape both its metallurgy and its geochemistry. Magnesium is also essential in biology, where it stabilizes phosphate chemistry and is central to chlorophyll.
Magnesium is a light, silvery-white, and fairly tough metal. It tarnishes slightly in air, and finely divided magnesium readily ignites upon heating in air and burns with a dazzling white flame.
The name derives from Magnesia, a district in the north-eastern region of Greece called Thessalia. The Scottish chemist Joseph Black recognized it as a separate element in 1755. In 1808, the English chemist Humphry Davy obtained the impure metal, and in 1831 the French pharmacist and chemist Antoine- Alexandre Brutus Bussy isolated the metal in the pure state.
Although it is the eighth most abundant element in the universe and the seventh most abundant element in the earth's crust, magnesium is never found free in nature. Magnesium was first isolated by Sir Humphry Davy, an English chemist, through the electrolysis of a mixture of magnesium oxide (MgO) and mercuric oxide (HgO) in 1808. Today, magnesium can be extracted from the minerals dolomite (CaCO3·MgCO3) and carnallite (KCl·MgCl2·6H2O), but is most often obtained from seawater. Every cubic kilometer of seawater contains about 1.3 billion kilograms of magnesium (12 billion pounds per cubic mile).
From Magnesia, district in Thessaly. Compounds of magnesium have long been known. Black recognized magnesium as an element in 1755. Davy isolated it in 1808 and Bussy prepared it in coherent form in 1831. Magnesium is the eighth most abundant element in the earth's crust. It does not occur uncombined, but is found in large deposits in the form of magnesite, dolomite, and other minerals.
Pure magnesium is a silvery-white metal with a bright metallic luster when freshly cut. In air it slowly dulls as a thin oxide and hydroxide film develops. It is light, machinable, and solid at ordinary conditions, but finely divided metal can burn with an intense white flame.
Magnesium metal is used mainly where low mass is valuable, especially in aluminum alloys, die-cast automotive and electronic parts, and some aerospace components. It serves as a reducing agent in the production of metals such as titanium from titanium tetrachloride (TiCl₄). Magnesium is used in sacrificial anodes for corrosion protection, in pyrotechnic compositions and flares, and in specialty batteries. Magnesium compounds are widely used in refractories, fertilizers, animal feed, pharmaceuticals, and water treatment.
Magnesium burns with a brilliant white light and is used in pyrotechnics, flares and photographic flashbulbs. Magnesium is the lightest metal that can be used to build things, although its use as a structural material is limited since it burns at relatively low temperatures. Magnesium is frequently alloyed with aluminum, which makes aluminum easier to roll, extrude and weld. Magnesium-aluminum alloys are used where strong, lightweight materials are required, such as in airplanes, missiles and rockets. Cameras, horseshoes, baseball catchers' masks and snowshoes are other items that are made from magnesium alloys.
Magnesium oxide (MgO), also known as magnesia, is the second most abundant compound in the earth's crust. Magnesium oxide is used in some antacids, in making crucibles and insulating materials, in refining some metals from their ores and in some types of cements. When combined with water (H2O), magnesia forms magnesium hydroxide (Mg(OH)2), better known as milk of magnesia, which is commonly used as an antacid and as a laxative.
Hydrated magnesium sulphate (MgSO4·7H2O), better known as Epsom salt, was discovered in 1618 by a farmer in Epsom, England, when his cows refused to drink the water from a certain mineral well. He tasted the water and found that it tasted very bitter. He also noticed that it helped heal scratches and rashes on his skin. Epsom salt is still used today to treat minor skin abrasions.
Other magnesium compounds include magnesium carbonate (MgCO3) and magnesium fluoride (MgF2). Magnesium carbonate is used to make some types of paints and inks and is added to table salt to prevent caking. A thin film of magnesium fluoride is applied to optical lenses to help reduce glare and reflections.
Uses include flashlight photography, flares, and pyrotechnics, including incendiary bombs. It is one third lighter than aluminum, and in alloys is essential for airplane and missile construction. The metal improves the mechanical, fabrication, and welding characteristics of aluminum when used as an alloying agent. Magnesium is used in producing nodular graphite in cast iron, and is used as an additive to conventional propellants.
It is also used as a reducing agent in the production of pure uranium and other metals from their salts. The hydroxide (milk of magnesia), chloride, sulfate (Epsom salts), and citrate are used in medicine. Dead-burned magnesite is employed for refractory purposes such as brick and liners in furnaces and converters.
Isotopes in Biology
Natural magnesium enriched in the stable isotopes 25Mg and 26Mg has been used as tracers in human studies to assess absorption, excretion, distribution, and utilization of magnesium in basic and applied research [108] World Nuclear Association. Radioisotopes in Industry: Industrial Uses of Radioisotopes, World Nuclear Association (2014), Feb. 24; http://www.world-nuclear.org/info/inf56.html., [113] M. Sabatier, W. R. Keyes, F. Pont, M. J. Arnaud, J. R. Turnlund. Am. J. Clin. Nutr.77, 1206 (2003)., [114] M. Sabatier, F. Pont, M. J. Arnaud, J. R. Turnlund. Am. J. Physiol.285, R656 (2003)..
Isotopes in Earth/Planetary Science
Molecules, atoms, and ions of the stable isotopes of magnesium 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. There are substantial variations in the isotopic abundances of magnesium in natural terrestrial materials (Fig. IUPAC.12.1). These variations are useful in investigating the origin of substances and studying environmental, hydrological, and geological processes [13] M. W. Wieser, T. B. Coplen. Pure Appl Chem.83, 359 (2011)., [17] T. B. Coplen, J. A. Hopple, J. K. Böhlke, H. S. Peiser, S. E. Rieder, H. R. Krouse, K. J. R. Rosman, T. Ding, R. D. Vocke, K. Revesz, A. Lamberty, P. D. P. Taylor, P. D. Bièvre. United States Geological Survey Water-Resources Investigations Report, 01-4222, (2002)., [115] J. G. Montes, R. A. Sjodin, A. L. Yergey, N. E. Vieira. Biophys. J.56, 437 (1989)..
Isotopes in Geochronology
26Mg is a stable isotope and is the radiogenic product of 26Al decay. 26Al is produced by cosmic rays in space and in the atmosphere, and it was present in the primordial solar nebula. The anomalous abundance of 26Mg in meteorite inclusions indicate that this material must have been formed early in the development of the Solar System before all primordial 26Al (with half-life of 7.1×105 years) had decayed [116] S. Sahijpal, J. N. Goswami. Astrophys. J.509, L137 (1998)..
Magnesium chemistry is dominated by the +2 oxidation state and by ionic or strongly polar compounds. Magnesium oxide (MgO) is a refractory basic oxide, while magnesium hydroxide (Mg(OH)₂) is sparingly soluble and used where mild alkalinity is needed. Important salts include magnesium chloride (MgCl₂), magnesium sulfate (MgSO₄), and magnesium carbonate (MgCO₃). Magnesium silicates are major constituents of rocks. Organomagnesium halides, known as Grignard reagents, are central synthetic intermediates in organic chemistry.
Organic magnesium is important in both plant and animal life. Chlorophylls are magnesium-centered perphyrins.
The adult daily nutritional requirement, which is affected by various factors include weight and size, is about 300 mg/day.
See more information at the Magnesium compound page.
Bulk magnesium metal is not highly toxic, and magnesium ions are essential nutrients. The main elemental hazard is fire: shavings, powder, and molten metal can ignite, and burning magnesium is difficult to extinguish with water because hydrogen and heat may be produced. Intense ultraviolet and visible light from burning magnesium can injure eyes. Excess intake of soluble magnesium salts can cause physiological effects, especially when renal clearance is impaired, and industrial dusts require exposure control.
Because serious fires can occur, great care should be taken in handling magnesium metal, especially when finely divided. Water should not be used on burning magnesium or on magnesium fires.
Magnesium is abundant in the crust and hydrosphere and cycles through weathering, river transport, seawater chemistry, carbonate deposition, and biological uptake. It is a common nutrient for plants and animals, and its availability affects soil fertility and water hardness. In the ocean, Mg²⁺ is one of the major dissolved cations. Magnesium minerals also participate in long-term carbon cycling through carbonate formation and alteration of silicate rocks.
Magnesium is produced from mineral sources and brines, chiefly by electrolysis of magnesium chloride (MgCl₂) or by thermal reduction of magnesium oxide (MgO)-bearing feedstocks such as dolomite-derived material. Energy cost, process emissions, and control of oxidation during melting are important industrial factors. Demand is tied to lightweight alloys, aluminum alloying, die casting, desulfurization and chemical uses. Recycling is significant for clean alloy scrap, although mixed or oxidized scrap is harder to recover efficiently. Substitution is possible in many structural applications, but magnesium remains attractive where low density outweighs cost and handling constraints.
The metal is now principally obtained in the U.S. by electrolysis of fused magnesium chloride derived from brines, wells, and sea water.
Magnesium is a relatively abundant cosmic element formed mainly by fusion processes in massive stars and dispersed by supernovae and stellar winds. It is common in silicate dust and rocky planetary material, where it combines with oxygen and silicon. In meteorites and terrestrial planets it is concentrated in minerals such as olivine and pyroxene rather than in metallic form.
- Magnesium burns in carbon dioxide (CO₂) as well as in air, forming magnesium oxide and carbon.
- Chlorophyll contains a magnesium ion held in a porphyrin ring.
- Seawater is an important practical source of magnesium, although the metal itself is not present there.
- Grignard reagents made from magnesium helped transform carbon-carbon bond formation in synthesis.
- Magnesium alloys often need protective atmospheres or fluxes during melting to limit oxidation.
Images
Propriétés
Propriétés physiques
- Rayon atomique (empirique)
- 150 pm Comparer : Rayon atomique (empirique) de tous les éléments →
- Rayon covalent
- 141 pm Comparer : Rayon covalent de tous les éléments →
- Rayon de van der Waals
- 173 pm Comparer : Rayon de van der Waals de tous les éléments →
- Rayon métallique
- 136 pm Comparer : Rayon métallique de tous les éléments →
- Masse volumique
- 1740 kg/m³ Comparer : Masse volumique de tous les éléments →
- Volume molaire
- 0,014 L/mol
- Phase aux CNTP
- Solide Comparer : Phase aux CNTP de tous les éléments →
- Point de fusion
- 649,85 °C Comparer : Point de fusion de tous les éléments →
- Point d’ébullition
- 1089,85 °C Comparer : Point d’ébullition de tous les éléments →
- Conductivité thermique
- 156 W/(m·K) Comparer : Conductivité thermique de tous les éléments →
- Capacité thermique massique
- 1,023 J/(g·K) Comparer : Capacité thermique massique de tous les éléments →
- Capacité thermique molaire
- 24,869 J/(mol·K) Comparer : Capacité thermique molaire de tous les éléments →
- Structure cristalline
- Hexagonal compact Comparer : Structure cristalline de tous les éléments →
Propriétés chimiques
- Électronégativité (Pauling)
- 1,31 Comparer : Électronégativité (Pauling) de tous les éléments →
- Électronégativité (Allen)
- 1,293
- Affinité électronique
- -0,4 eV (valeur négative — l'atome ne devrait pas lier d'électron supplémentaire)
- Énergie d’ionisation (1re)
- 7,646236 eV Comparer : Énergie d’ionisation (1re) de tous les éléments →
- Énergie d’ionisation (2e)
- 15,035323 eV Comparer : Énergie d’ionisation (2e) de tous les éléments →
- Énergie d’ionisation (3e)
- 80,143876 eV Comparer : Énergie d’ionisation (3e) de tous les éléments →
- Énergie d’ionisation (4e)
- 109,265776 eV Comparer : Énergie d’ionisation (4e) de tous les éléments →
- Énergie d’ionisation (5e)
- 141,330486 eV Comparer : Énergie d’ionisation (5e) de tous les éléments →
- États d’oxydation
- 0, +1, +2 Comparer : États d’oxydation de tous les éléments →
- Électrons de valence
- 2 Comparer : Électrons de valence de tous les éléments →
- Configuration électronique
- [Ne] 3s2
Propriétés thermodynamiques
- Enthalpie de fusion
- 0,08788931 eV Comparer : Enthalpie de fusion de tous les éléments →
- Enthalpie de vaporisation
- 1,326631 eV Comparer : Enthalpie de vaporisation de tous les éléments →
- Enthalpie de sublimation
- 1,524589 eV
- Enthalpie d’atomisation
- 1,524589 eV
- Enthalpie d’atomisation
- 1,524589 eV
Propriétés nucléaires
- Protons
- 12 Comparer : Protons de tous les éléments →
- Neutrons
- 12 Comparer : Neutrons de tous les éléments →
- Isotopes connus
- 23 Comparer : Isotopes connus de tous les éléments →
- Isotopes stables
- 3 Comparer : Isotopes stables de tous les éléments →
- Isotope le plus stable
- Mg-24
- Année de découverte
- 1755
Abondance
- Abondance (croûte terrestre)
- 2,33e+4 mg/kg Comparer : Abondance (croûte terrestre) de tous les éléments →
- Abondance (océan)
- 1290 mg/L Comparer : Abondance (océan) de tous les éléments →
Structure cristalline
- Paramètre de maille a
- 321 pm
Structure électronique
- Électrons par couche
- 2, 8, 2 Comparer : Électrons par couche de tous les éléments →
Identifiants
- Numéro CAS
- 7439-95-4 Comparer : Numéro CAS de tous les éléments →
- Symbole de terme
- 1S0
- InChI
- InChI=1S/Mg
- Clé InChI
- FYYHWMGAXLPEAU-UHFFFAOYSA-N
Configuration électronique Mesuré
Mg: 3s²[Ne] 3s²1s² 2s² 2p⁶ 3s²Modèle 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 |
|---|---|---|---|
| 24 Stable | 23,985041697 ± 0,000000014 | 78,9900% | Stable |
| 25 Stable | 24,985836976 ± 0,00000005 | 10,0000% | Stable |
| 26 Stable | 25,982592968 ± 0,000000031 | 11,0100% | Stable |
Phase / État
Explication: 624,9 °C en dessous du point de fusion (649,85 °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
Affichage de 10 sur 12. Tri par charge ionique croissante.
Raies répertoriées ?
| Ion | Charge | Nombre total de raies | Probabilités de transition | Désignations des niveaux |
|---|---|---|---|---|
| Mg I | 0 | 1342 | 1090 | 1342 |
| Mg II | +1 | 601 | 482 | 601 |
| Mg III | +2 | 452 | 149 | 452 |
| Mg IV | +3 | 821 | 625 | 821 |
| Mg V | +4 | 518 | 513 | 515 |
| Mg VI | +5 | 890 | 883 | 890 |
| Mg VII | +6 | 379 | 344 | 379 |
| Mg VIII | +7 | 944 | 941 | 944 |
| Mg IX | +8 | 461 | 444 | 461 |
| Mg X | +9 | 223 | 184 | 223 |
Niveaux répertoriés ?
| Ion | Charge | Niveaux |
|---|---|---|
| Mg I | 0 | 323 |
| Mg II | +1 | 149 |
| Mg III | +2 | 114 |
| Mg IV | +3 | 173 |
| Mg V | +4 | 104 |
| Mg VI | +5 | 120 |
| Mg VII | +6 | 104 |
| Mg VIII | +7 | 113 |
| Mg IX | +8 | 94 |
| Mg X | +9 | 60 |
Rayons ioniques
| Charge | Coordinence | Spin | Rayon |
|---|---|---|---|
| +2 | 4 | N/D | 56.99999999999999 pm |
| +2 | 5 | N/D | 66 pm |
| +2 | 6 | N/D | 72 pm |
| +2 | 8 | N/D | 89 pm |
Composés
Isotopes (3)
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie | Mode de désintégration | |
|---|---|---|---|---|---|
| 24 Stable | 23,985041697 ± 0,000000014 | 78,9900% ± 0,0400% | Stable | stable | |
| 25 Stable | 24,985836976 ± 0,00000005 | 10,0000% ± 0,0100% | Stable | stable | |
| 26 Stable | 25,982592968 ± 0,000000031 | 11,0100% ± 0,0300% | Stable | stable |
Raies spectrales
Affichage de 50 sur 399. Seules les raies spectrales dont l’intensité a été mesurée sont affichées par défaut.
| Longueur d’onde (nm) | Intensité | Degré d’ionisation | Type | Transition | Précision | Source | |
|---|---|---|---|---|---|---|---|
| 518.36043 nm | 45 | Mg I | emission | 3s.3p 3P* → 3s.4s 3S | Mesurée | NIST | |
| 517.26844 nm | 44 | Mg I | emission | 3s.3p 3P* → 3s.4s 3S | Mesurée | NIST | |
| 516.73213 nm | 42 | Mg I | emission | 3s.3p 3P* → 3s.4s 3S | Mesurée | NIST | |
| 383.82919 nm | 40 | Mg I | emission | 3s.3p 3P* → 3s.3d 3D | Mesurée | NIST | |
| 552.84047 nm | 40 | Mg I | emission | 3s.3p 1P* → 3s.4d 1D | Mesurée | NIST | |
| 383.23039 nm | 38 | Mg I | emission | 3s.3p 3P* → 3s.3d 3D | Mesurée | NIST | |
| 382.93547 nm | 36 | Mg I | emission | 3s.3p 3P* → 3s.3d 3D | Mesurée | NIST | |
| 470.29908 nm | 30 | Mg I | emission | 3s.3p 1P* → 3s.5d 1D | Mesurée | NIST | |
| 571.1088 nm | 30 | Mg I | emission | 3s.3p 1P* → 3s.5s 1S | Mesurée | NIST | |
| 435.19057 nm | 20 | Mg I | emission | 3s.3p 1P* → 3s.6d 1D | Mesurée | NIST | |
| 416.72713 nm | 15 | Mg I | emission | 3s.3p 1P* → 3s.7d 1D | Mesurée | NIST | |
| 625.6757 nm | 15 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4s 2[3/2]* → 2s2.2p5.(2P*<3/2>).4p 2[5/2] | Mesurée | NIST | |
| 448.1126 nm | 14 | Mg II | emission | 2p6.3d 2D → 2p6.4f 2F* | Mesurée | NIST | |
| 448.1325 nm | 13 | Mg II | emission | 2p6.3d 2D → 2p6.4f 2F* | Mesurée | NIST | |
| 738.7689 nm | 12 | Mg I | emission | 3s.3d 1D → 3s.8f 1F* | Mesurée | NIST | |
| 405.75052 nm | 10 | Mg I | emission | 3s.3p 1P* → 3s.8d 1D | Mesurée | NIST | |
| 439.0572 nm | 10 | Mg II | emission | 2p6.4p 2P* → 2p6.5d 2D | Mesurée | NIST | |
| 473.00286 nm | 10 | Mg I | emission | 3s.3p 1P* → 3s.6s 1S | Mesurée | NIST | |
| 491.5991 nm | 10 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[5/2] → 2s2.2p5.(2P*<3/2>).4d 2[7/2]* | Mesurée | NIST | |
| 583.981 nm | 10 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4s 2[3/2]* → 2s2.2p5.(2P*<3/2>).4p 2[3/2] | Mesurée | NIST | |
| 631.8717 nm | 10 | Mg I | emission | 3s.4s 3S → 3s.6p 3P* | Mesurée | NIST | |
| 634.6742 nm | 10 | Mg II | emission | 2p6.4d 2D → 2p6.6f 2F* | Mesurée | NIST | |
| 719.3184 nm | 10 | Mg I | emission | 3s.3d 1D → 3s.9f 1F* | Mesurée | NIST | |
| 729.1055 nm | 10 | Mg I | emission | 3s.4s 1S → 3s.6p 1P* | Mesurée | NIST | |
| 438.4637 nm | 9 | Mg II | emission | 2p6.4p 2P* → 2p6.5d 2D | Mesurée | NIST | |
| 443.3988 nm | 9 | Mg II | emission | 2p6.4p 2P* → 2p6.6s 2S | Mesurée | NIST | |
| 452.6219 nm | 9 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[1/2] → 2s2.2p5.(2P*<3/2>).4d 2[3/2]* | Mesurée | NIST | |
| 459.6921 nm | 9 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[1/2] → 2s2.2p5.(2P*<3/2>).4d 2[1/2]* | Mesurée | NIST | |
| 496.041 nm | 9 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[5/2] → 2s2.2p5.(2P*<3/2>).4d 2[7/2]* | Mesurée | NIST | |
| 631.9237 nm | 9 | Mg I | emission | 3s.4s 3S → 3s.6p 3P* | Mesurée | NIST | |
| 634.6964 nm | 9 | Mg II | emission | 2p6.4d 2D → 2p6.6f 2F* | Mesurée | NIST | |
| 384.8211 nm | 8 | Mg II | emission | 2p6.3d 2D → 2p6.5p 2P* | Mesurée | NIST | |
| 398.67533 nm | 8 | Mg I | emission | 3s.3p 1P* → 3s.9d 1D | Mesurée | NIST | |
| 442.7994 nm | 8 | Mg II | emission | 2p6.4p 2P* → 2p6.6s 2S | Mesurée | NIST | |
| 467.3315 nm | 8 | Mg III | emission | 2s2.2p5.(2P*<1/2>).4s 2[1/2]* → 2s2.2p5.(2P*<1/2>).4p 2[1/2] | Mesurée | NIST | |
| 498.1469 nm | 8 | Mg III | emission | 2s2.2p5.(2P*<1/2>).4p 2[3/2] → 2s2.2p5.(2P*<1/2>).4d 2[5/2]* | Mesurée | NIST | |
| 526.422 nm | 8 | Mg II | emission | 2p6.4d 2D → 2p6.7f 2F* | Mesurée | NIST | |
| 640.6637 nm | 8 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4s 2[3/2]* → 2s2.2p5.(2P*<3/2>).4p 2[5/2] | Mesurée | NIST | |
| 678.7855 nm | 8 | Mg II | emission | 2p6.5p 2P* → 2p6.7d 2D | Mesurée | NIST | |
| 681.927 nm | 8 | Mg II | emission | 2p6.5p 2P* → 2p6.8s 2S | Mesurée | NIST | |
| 706.0414 nm | 8 | Mg I | emission | 3s.3d 1D → 3s.10f 1F* | Mesurée | NIST | |
| 385.0386 nm | 7 | Mg II | emission | 2p6.3d 2D → 2p6.5p 2P* | Mesurée | NIST | |
| 423.9473 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4s 2[3/2]* → 2s2.2p5.(2P*<1/2>).4p 2[1/2] | Mesurée | NIST | |
| 463.2537 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[1/2] → 2s2.2p5.(2P*<3/2>).4d 2[1/2]* | Mesurée | NIST | |
| 480.2585 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[3/2] → 2s2.2p5.(2P*<3/2>).4d 2[3/2]* | Mesurée | NIST | |
| 491.5363 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<1/2>).4p 2[3/2] → 2s2.2p5.(2P*<1/2>).4d 2[5/2]* | Mesurée | NIST | |
| 497.0497 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[3/2] → 2s2.2p5.(2P*<3/2>).4d 2[5/2]* | Mesurée | NIST | |
| 502.3674 nm | 7 | Mg III | emission | 2s2.2p5.(2P*<3/2>).4p 2[3/2] → 2s2.2p5.(2P*<3/2>).4d 2[5/2]* | Mesurée | NIST | |
| 526.4364 nm | 7 | Mg II | emission | 2p6.4d 2D → 2p6.7f 2F* | Mesurée | NIST | |
| 591.6431 nm | 7 | Mg II | emission | 2p6.4d 2D → 2p6.7p 2P* | Mesurée | NIST |
Propriétés étendues
Rayons covalents (données étendues)
- Rayon covalent (Pyykkö)
- 139 pm
- Rayon covalent (Pyykkö, liaison double)
- 132 pm
- Rayon covalent (Pyykkö, liaison triple)
- 127 pm
- Rayon covalent (Bragg)
- 142 pm
Rayons de van der Waals
- Bondi
- 173 pm
- Batsanov
- 220 pm
- Alvarez
- 251 pm
- UFF
- 302,1 pm
- MM3
- 243 pm
Rayons atomiques et métalliques
- Rayon atomique (Rahm)
- 240 pm
- Rayon métallique (C12)
- 160 pm
Échelles de numérotation
- Mendeleev
- 76
- Pettifor
- 73
- Glawe
- 73
Échelles d’électronégativité
- Ghosh
- 0
- Miedema
- 3
- Gunnarsson–Lundqvist
- 3
- Robles–Bartolotti
- 3
Polarisabilité et dispersion
- Polarisabilité dipolaire
- 71,2 a.u.
- Polarisabilité dipolaire (incertitude)
- 0,4 a.u.
- C₆
- 626 Ha·Bohr6
- C₆ (Gould–Bučko)
- 629 Ha·Bohr6
Affinité chimique
- Affinité protonique
- 819,6 kJ/mol
- Basicité en phase gazeuse
- 797,3 kJ/mol
Paramètres de Miedema
- Volume molaire de Miedema
- 14 cm3/mol
- Densité électronique de Miedema
- 2
Risque d’approvisionnement et économie
- Concentration de la production
- 64
- Risque relatif d’approvisionnement
- 7
- Répartition des réserves
- 26
- Stabilité politique (principal producteur)
- 24
- Stabilité politique (principal détenteur de réserves)
- 18
Transitions de phase et allotropes
| Point de fusion | 923,15 K |
| Point d’ébullition | 1363,15 K |
Catégories d’états d’oxydation
Données de référence avancées
Constantes d’écran (4)
| n | Orbitale | σ |
|---|---|---|
| 1 | s | 0,3911 |
| 2 | p | 4,1742 |
| 2 | s | 4,608 |
| 3 | s | 8,6925 |
Détail des rayons cristallins (4)
| Charge | CN | Spin | rcrystal (pm) | Origine |
|---|---|---|---|---|
| 2 | IV | 71 | ||
| 2 | V | 80 | ||
| 2 | VI | 86 | ||
| 2 | VIII | 103 | calculated, |
Modes de désintégration des isotopes (43)
| Isotope | Mode | Intensité |
|---|---|---|
| 19 | 2p | 100% |
| 20 | B+ | 100% |
| 20 | B+p | 30,3% |
| 21 | B+ | 100% |
| 21 | B+p | 20,1% |
| 21 | B+A | 0,1% |
| 21 | B+pA | 0% |
| 22 | B+ | 100% |
| 23 | B+ | 100% |
| 27 | B- | 100% |
Facteurs de diffusion des rayons X (755)
| Énergie (eV) | f₁ | f₂ |
|---|---|---|
| 0,5 | 0,117 | 0,14592 |
| 0,5079 | 0,1168 | 0,14896 |
| 0,516 | 0,1165 | 0,15206 |
| 0,5242 | 0,1165 | 0,15522 |
| 0,5325 | 0,1162 | 0,15845 |
| 0,5409 | 0,1162 | 0,16175 |
| 0,5495 | 0,1162 | 0,16511 |
| 0,5582 | 0,1161 | 0,16855 |
| 0,5671 | 0,1163 | 0,17205 |
| 0,5761 | 0,1167 | 0,17558 |
Données complémentaires
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
2.33×104 milligrams per kilogram
Références (1)
- [5] Magnesium https://education.jlab.org/itselemental/ele012.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
1.29×103 milligrams per liter
Références (1)
- [5] Magnesium https://education.jlab.org/itselemental/ele012.html
Sources
Sources of this element.
The metal is now principally obtained in the U.S. by electrolysis of fused magnesium chloride derived from brines, wells, and sea water.
Références (1)
- [6] Magnesium https://periodic.lanl.gov/12.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 Magnesium.
The element property data was retrieved from publications.