Molybdenum (Mo)
transition-metalSolid
Peso atomico standard
95,95 uConfigurazione elettronica
[Kr] 5s1 4d5Punto di fusione
2622,85 °CPunto di ebollizione
4638,85 °CDensità
1,02e+4 kg/m³Stati di ossidazione
−4, −2, −1, 0, +1, +2, +3, +4, +5, +6Elettronegatività (Pauling)
2,16Energia di ionizzazione (1ª)
7,09243 eVAnno della scoperta
1778Raggio atomico
145 pmDettagli
Molybdenum is a hard refractory transition metal of group 6. It is notable for its high melting point, useful alloying behavior, and rich redox chemistry. In nature it occurs mainly as molybdenite, and industrially it is important in steels, superalloys, catalysts, and lubricating sulfide materials. In biology, molybdenum is an essential trace element because several enzymes use molybdenum cofactors for oxygen-atom transfer and related redox reactions.
The metal is silvery white, very hard, but is softer and more ductile than tungsten. It has a high elastic modulus, and only tungsten and tantalum, of the more readily available metals, have higher melting points. It is a valuable alloying agent, as it contributes to the hardenability and toughness of quenched and tempered steels. It also improves the strength of steel at high temperatures.
The name derives from the Greek molybdos for "lead". The ancients used the term "lead" for any black mineral that leaves a mark on paper. Molybdenum was discovered by the Swedish pharmacist and chemist Carl Wilhelm Scheele in 1778. It was first isolated by the Swedish chemist Peter-Jacob Hjelm in 1781.
Molybdenum was discovered by Carl Welhelm Scheele, a Swedish chemist, in 1778 in a mineral known as molybdenite (MoS2) which had been confused as a lead compound. Molybdenum was isolated by Peter Jacob Hjelm in 1781. Today, most molybdenum is obtained from molybdenite, wulfenite (PbMoO4) and powellite (CaMoO4). These ores typically occur in conjunction with ores of tin and tungsten. Molybdenum is also obtained as a byproduct of mining and processing tungsten and copper.
From the Greek word molybdo, lead. Before Scheele recognized molybdenite as a distinct ore of a new element in 1778, it was confused with graphite and lead ore. The metal was prepared in impure form in 1782 by Hjelm. Molybdenum does not occur natively, but is obtained principally from molybdenite. Wulfenite, and Powellite are also minor commercial ores.
Pure molybdenum is a silvery gray metal with a bright metallic luster when freshly prepared. It is solid under ordinary conditions, dense, and mechanically strong at elevated temperature. Massive metal is much less reactive than fine powder, which has a larger surface area and oxidizes more readily.
Molybdenum is used chiefly as an alloying element in steels and cast irons, where it improves hardenability, high-temperature strength, creep resistance, and resistance to some forms of corrosion. Molybdenum metal and alloys are used in high-temperature furnace parts, electrical contacts, glass-melting electrodes, and sputtering targets. Molybdenum disulfide, MoS₂, is a solid lubricant. Molybdenum compounds are also used in petroleum refining catalysts, pigments, corrosion inhibitors, and as sources for producing the medical isotope technetium-99m from molybdenum-99.
Molybdenum has a high melting point and is used to make the electrodes of electrically heated glass furnaces. Some electrical filaments are also made from molybdenum. The metal is used to make some missile and aircraft parts and is used in the nuclear power industry. Molybdenum is also used as a catalyst in the refining of petroleum.
Molybdenum is primarily used as an alloying agent in steel. When added to steel in concentrations between 0.25% and 8%, molybdenum forms ultra-high strength steels that can withstand pressures up to 300,000 pounds per square inch. Molybdenum also improves the strength of steel at high temperatures. When alloyed with nickel, molybdenum forms heat and corrosion resistant materials used in the chemical industry.
Molybdenum disulfide (MoS2), one of molybdenum's compounds, is used as a high temperature lubricant. Molybdenum trioxide (MoO3), another molybdenum compound, is used to adhere enamels to metals. Other molybdenum compounds include: molybdic acid (H2MoO4), molybdenum hexafluoride (MoF6) and molybdenum phosphide (MoP2).
It is used in certain nickel-based alloys, such as the "Hastelloys(R)" which are heat-resistant and corrosion-resistant to chemical solutions. Molybdenum oxidizes at elevated temperatures. The metal has found recent application as electrodes for electrically heated glass furnaces and forehearths. The metal is also used in nuclear energy applications and for missile and aircraft parts. Molybdenum is valuable as a catalyst in the refining of petroleum. It has found applications as a filament material in electronic and electrical applications. Molybdenum is an essential trace element in plant nutrition; some lands are barren for lack of this element in the soil. Molybdenum sulfide is useful as a lubricant, especially at high temperatures where oils would decompose. Almost all ultra-high strength steels with minimum yield points up to 300,000 psi (lb/in.2) contain molybdenum in amounts from 0.25 to 8%. Biologically, molybdenum as a trace element is necessary for nitrogen fixation and other metabolic processes.
Isotopes in Earth/Planetary Science
Molybdenites display a variation in isotopic composition (Fig. IUPAC.42.1) [316] A. J. Pietruszka, R. J. Walker, P. A. Candela. Chem. Geol.225, 121 (2006).. The isotopic composition of molybdenum in ocean sediments depends on oxygen levels in the ocean. When oxygen levels are high, the lighter isotopes of molybdenum are scavenged by iron and manganese oxides into sediments. However, when oxygen levels are low, the mechanism for molybdenum removal becomes more efficient and more of the heavier isotopes of molybdenum are found in iron and manganese oxides. Thus, the molybdenum isotopic composition of these sediments can be used as a proxy for oxygen levels in the paleo oceans (history of the oceans in the geological past) to gain insights into mechanisms that may have been responsible for mass-extinction events in the Earth’s history [317] B. C. Proemse, S. E. Grasby, M. E. Wieser, B. Mayer, B. Beauchamp. Geology41, 967 (2013)..
Isotopes in Industry
Depleted 95Mo has been used in the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (Tennessee, USA). The use of U-10Mo fuel elements (90 percent uranium, 10 percent molybdenum) would allow the conversion from high-enrichment uranium (HEU) fuel, 92 percent, to low-enrichment uranium (LEU) fuel, below 20 percent, for nuclear non-proliferation purposes [319] S. Mirzadeh, F. F. Knapp Jr., E. D. Collins. 5774782, Filed..
Isotopes Used as a Source of Radioactive Isotope(s)
95Mo is used to produce medical radioisotope 97Ru via the 95Mo (4He, 2n) 97Ru reaction. The isotope 99Mo is commercially produced by the fission of 235U and is the parent radionuclide of 99mTc, which is the most widely used radiopharmaceutical in the world. The much longer half-life of 99Mo (about 66 h) enables the radionuclide to be transported more easily than the short-lived (6 h half-life) 99mTc. The n(99Mo)/n(99mTc) amount-ratio generator was originally developed at Brookhaven National Laboratory (Fig. IUPAC.42.2) in the early 1960s and is now a patented system [320] U. Abram, R. Alberto. J. Braz. Chem. Soc.17, 1486 (2006)..
Molybdenum chemistry is dominated by oxidation states from 0 to +6, with +4, +5, and +6 especially common. Molybdenum trioxide, MoO₃, and molybdates such as sodium molybdate, Na₂MoO₄, contain Mo(VI) and are important industrial and laboratory materials. Molybdenum disulfide, MoS₂, has a layered structure and is both a mineral and a useful solid lubricant. The element also forms halides such as molybdenum pentachloride, MoCl₅, organometallic carbonyls such as molybdenum hexacarbonyl, Mo(CO)₆, and many cluster compounds with metal-metal bonding.
See more information at the Molybdenum compound page.
Massive molybdenum metal is not highly hazardous in normal handling, but dusts and fumes can irritate the respiratory tract and may present combustible-dust risks under some conditions. Soluble molybdates can be toxic at elevated exposure, and excessive intake interferes with copper metabolism in animals. Molybdenum-99 is radioactive and must be handled with isotope-specific controls. Strong oxidizing or volatile molybdenum compounds require compound-specific precautions.
Molybdenum is a trace element in rocks, soils, waters, and living organisms. Weathering releases molybdate species, which are relatively mobile under neutral to alkaline oxidizing conditions and less mobile where adsorption or sulfide formation is favored. It is an essential micronutrient for plants and microorganisms, especially in nitrogen metabolism, but high soil molybdenum can contribute to copper deficiency in grazing animals.
Commercial molybdenum is obtained mainly from molybdenite concentrates, either from primary molybdenum mines or as a by-product of copper porphyry operations. Roasting converts molybdenite to molybdenum trioxide, MoO₃, which can be purified, reduced to metal, or converted to ferro-molybdenum for steelmaking. Demand is closely tied to alloy steel, stainless steel, energy, chemical processing, and catalyst markets. Recycling occurs from alloy scrap and spent catalysts, although recovery depends on grade, contamination, and processing economics.
Molybdenum is also recovered as a by-product of copper and tungsten mining operations. The metal is prepared from the powder made by the hydrogen reduction of purified molybdic trioxide or ammonium molybdate.
Molybdenum is a moderately rare heavy element in the cosmos. Its stable isotopes are produced by several nucleosynthetic processes, including slow and rapid neutron capture, with some proton-rich isotopes associated with rarer p-process pathways. In planetary materials it behaves as a refractory and siderophile to chalcophile element, so its distribution records metal-silicate separation and sulfide chemistry.
- Molybdenum has seven naturally occurring stable isotopes.
- The name comes from an old term for lead-like minerals, because molybdenite was once confused with graphite and lead ore
- Molybdenum disulfide keeps lubricating in vacuum better than many oils.
- Molybdenum enzymes are essential for nitrate reduction in many plants.
- Ferro-molybdenum is often the practical form added to steel melts.
Immagini
Proprietà
Fisiche
- Raggio atomico (empirico)
- 145 pm Confronta Raggio atomico (empirico) di tutti gli elementi →
- Raggio covalente
- 154 pm Confronta Raggio covalente di tutti gli elementi →
- Raggio di van der Waals
- 209 pm Confronta Raggio di van der Waals di tutti gli elementi →
- Raggio metallico
- 130 pm Confronta Raggio metallico di tutti gli elementi →
- Densità
- 1,02 × 104 kg/m³ Confronta Densità di tutti gli elementi →
- Volume molare
- 0,0094 L/mol
- Fase in condizioni STP
- Solido Confronta Fase in condizioni STP di tutti gli elementi →
- Punto di fusione
- 2622,85 °C Confronta Punto di fusione di tutti gli elementi →
- Punto di ebollizione
- 4638,85 °C Confronta Punto di ebollizione di tutti gli elementi →
- Capacità termica specifica
- 0,251 J/(g·K) Confronta Capacità termica specifica di tutti gli elementi →
- Capacità termica molare
- 24,06 J/(mol·K) Confronta Capacità termica molare di tutti gli elementi →
- Struttura cristallina
- Cubica a corpo centrato Confronta Struttura cristallina di tutti gli elementi →
Chimiche
- Elettronegatività (Pauling)
- 2,16 Confronta Elettronegatività (Pauling) di tutti gli elementi →
- Elettronegatività (Allen)
- 1,47
- Affinità elettronica
- 0,744 eV
- Energia di ionizzazione (1ª)
- 7,09243 eV Confronta Energia di ionizzazione (1ª) di tutti gli elementi →
- Energia di ionizzazione (2ª)
- 16,160056 eV Confronta Energia di ionizzazione (2ª) di tutti gli elementi →
- Energia di ionizzazione (3ª)
- 27,130093 eV Confronta Energia di ionizzazione (3ª) di tutti gli elementi →
- Energia di ionizzazione (4ª)
- 40,330139 eV Confronta Energia di ionizzazione (4ª) di tutti gli elementi →
- Energia di ionizzazione (5ª)
- 54,417187 eV Confronta Energia di ionizzazione (5ª) di tutti gli elementi →
- Stati di ossidazione
- −4, −2, −1, 0, +1, +2, +3, +4, +5, +6 Confronta Stati di ossidazione di tutti gli elementi →
- Elettroni di valenza
- 6 Confronta Elettroni di valenza di tutti gli elementi →
- Configurazione elettronica
- [Kr] 5s1 4d5
Termodinamiche
- Calore di fusione
- 0,29020055 eV Confronta Calore di fusione di tutti gli elementi →
- Calore di vaporizzazione
- 5,088874 eV Confronta Calore di vaporizzazione di tutti gli elementi →
- Calore di sublimazione
- 6,819713 eV
- Calore di atomizzazione
- 6,819713 eV
- Entalpia di atomizzazione
- 6,82987 eV
Nucleari
- Protoni
- 42 Confronta Protoni di tutti gli elementi →
- Neutroni
- 54 Confronta Neutroni di tutti gli elementi →
- Isotopi noti
- 39 Confronta Isotopi noti di tutti gli elementi →
- Isotopi stabili
- 4 Confronta Isotopi stabili di tutti gli elementi →
- Isotopo più stabile
- Mo-96
- Anno della scoperta
- 1778
Abbondanza
- Abbondanza (crosta terrestre)
- 1,2 mg/kg Confronta Abbondanza (crosta terrestre) di tutti gli elementi →
- Abbondanza (oceano)
- 0,01 mg/L Confronta Abbondanza (oceano) di tutti gli elementi →
Struttura cristallina
- Costante reticolare a
- 315 pm
Struttura elettronica
- Elettroni per guscio
- 2, 8, 18, 13, 1 Confronta Elettroni per guscio di tutti gli elementi →
Identificativi
- Numero CAS
- 7439-98-7 Confronta Numero CAS di tutti gli elementi →
- Simbolo di termine
- 7S3
- InChI
- InChI=1S/Mo
- Chiave InChI
- ZOKXTWBITQBERF-UHFFFAOYSA-N
Configurazione elettronica Misurato
Mo: 4d⁵ 5s¹[Kr] 4d⁵ 5s¹1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s¹Modello atomico
Gli isotopi modificano il numero di neutroni, la massa e la stabilità — non la configurazione elettronica di un atomo neutro.
Modello atomico schematico, non in scala.
Impronta atomica
Spettro di emissione / assorbimento
Distribuzione isotopica
| Numero di massa | Massa atomica (u) | Abbondanza naturale | Emivita |
|---|---|---|---|
| 94 Stabile | 93,9050849 ± 0,00000048 | 9,1500% | Stabile |
| 95 Stabile | 94,90583877 ± 0,00000047 | 15,8400% | Stabile |
| 96 Stabile | 95,90467612 ± 0,00000047 | 16,6700% | Stabile |
| 97 Stabile | 96,90601812 ± 0,00000049 | 9,6000% | Stabile |
Fase / Stato
Motivo: 2597,8 °C sotto il punto di fusione (2622,85 °C)
Schema non in scala
Punti di transizione di fase
Energie di transizione
Energia necessaria per fondere 1 mol al punto di fusione
Energia necessaria per vaporizzare 1 mol al punto di ebollizione
Energia necessaria per sublimare 1 mol al punto di sublimazione
Densità
In condizioni standard
In condizioni standard
Spettri atomici
Sono visualizzati 10 di 42. Ordinamento per carica ionica crescente.
Righe disponibili ?
| Ione | Carica | Righe totali | Probabilità di transizione | Designazioni dei livelli |
|---|---|---|---|---|
| Mo I | 0 | 818 | 721 | 808 |
| Mo II | +1 | 209 | 0 | 0 |
| Mo III | +2 | 62 | 0 | 0 |
| Mo IV | +3 | 29 | 0 | 0 |
| Mo V | +4 | 966 | 923 | 929 |
| Mo VI | +5 | 245 | 245 | 245 |
| Mo VII | +6 | 413 | 0 | 413 |
| Mo VIII | +7 | 109 | 0 | 109 |
| Mo IX | +8 | 231 | 0 | 231 |
| Mo X | +9 | 120 | 0 | 120 |
Livelli disponibili ?
| Ione | Carica | Livelli |
|---|---|---|
| Mo I | 0 | 428 |
| Mo II | +1 | 249 |
| Mo III | +2 | 120 |
| Mo IV | +3 | 81 |
| Mo V | +4 | 258 |
| Mo VI | +5 | 113 |
| Mo VII | +6 | 96 |
| Mo VIII | +7 | 77 |
| Mo IX | +8 | 93 |
| Mo X | +9 | 48 |
Raggi ionici
| Carica | Coordinazione | Spin | Raggio |
|---|---|---|---|
| +3 | 6 | N/D | 69 pm |
| +4 | 6 | N/D | 65 pm |
| +5 | 4 | N/D | 46 pm |
| +5 | 6 | N/D | 61 pm |
| +6 | 4 | N/D | 41 pm |
| +6 | 5 | N/D | 50 pm |
| +6 | 6 | N/D | 59 pm |
| +6 | 7 | N/D | 73 pm |
Composti
Isotopi (4)
| Numero di massa | Massa atomica (u) | Abbondanza naturale | Emivita | Modalità di decadimento | |
|---|---|---|---|---|---|
| 94 Stabile | 93,9050849 ± 0,00000048 | 9,1500% ± 0,0900% | Stabile | stable | |
| 95 Stabile | 94,90583877 ± 0,00000047 | 15,8400% ± 0,1100% | Stabile | stable | |
| 96 Stabile | 95,90467612 ± 0,00000047 | 16,6700% ± 0,1500% | Stabile | stable | |
| 97 Stabile | 96,90601812 ± 0,00000049 | 9,6000% ± 0,1400% | Stabile | stable |
Righe spettrali
| Lunghezza d'onda (nm) | Intensità | Stadio di ionizzazione | Tipo | Transizione | Accuratezza | Fonte | |
|---|---|---|---|---|---|---|---|
| 382.2548 nm | 290 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3P* | Misurata | NIST | |
| 383.9084 nm | 360 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3P* | Misurata | NIST | |
| 386 nm | N/D | ID 915 | emission | 1s.5s 3S → 1s.5p 3P* | Misurata | NIST | |
| 393.8911 nm | 1400 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3P* | Misurata | NIST | |
| 394.8336 nm | 50 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 1F* | Misurata | NIST | |
| 400.9437 nm | 35 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 1D* | Misurata | NIST | |
| 403.6485 nm | 40 | Mo VI | emission | 4p6.7f 2F* → 4p6.8g 2G | Misurata | NIST | |
| 405.4556 nm | 50 | Mo VI | emission | 4p6.7f 2F* → 4p6.8g 2G | Misurata | NIST | |
| 406.1547 nm | 210 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3P* | Misurata | NIST | |
| 406.2019 nm | 15000 | Mo VI | emission | 4p6.7p 2P* → 4p6.7d 2D | Misurata | NIST | |
| 406.4706 nm | 14 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 1D* | Misurata | NIST | |
| 406.527 nm | 3500 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3F* | Misurata | NIST | |
| 407.1568 nm | 2800 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 1F* | Misurata | NIST | |
| 407.4773 nm | 3100 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3F* | Misurata | NIST | |
| 416.4901 nm | 75 | Mo VI | emission | 4p6.6g 2G → 4p6.7f 2F* | Misurata | NIST | |
| 418.4284 nm | 60 | Mo VI | emission | 4p6.6g 2G → 4p6.7f 2F* | Misurata | NIST | |
| 418.6616 nm | 2700 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3D* | Misurata | NIST | |
| 422.59 nm | N/D | ID 896 | emission | 2p 2P* → 2s 2S | Misurata | NIST | |
| 423.2026 nm | 40000 | Mo VI | emission | 4p6.7p 2P* → 4p6.7d 2D | Misurata | NIST | |
| 427.2928 nm | 100 | Mo VI | emission | 4p6.7p 2P* → 4p6.7d 2D | Misurata | NIST | |
| 433.4926 nm | 840 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3D* | Misurata | NIST | |
| 436 nm | N/D | ID 915 | emission | 1s.4p 3P* → 1s.4d 3D | Misurata | NIST | |
| 438.442 nm | 2900 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3D* | Misurata | NIST | |
| 439.9605 nm | 28 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3D* | Misurata | NIST | |
| 446.6307 nm | 79 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 1D* | Misurata | NIST | |
| 447.4143 nm | 63 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3F* | Misurata | NIST | |
| 454.3076 nm | 570 | Mo V | emission | 4p6.4d.(2D<3/2>).6s 2[3/2] → 4p6.4d.6p 3F* | Misurata | NIST | |
| 462.464 nm | 840 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 1D* | Misurata | NIST | |
| 463.7675 nm | 41 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3F* | Misurata | NIST | |
| 466.0971 nm | 100 | Mo VI | emission | 4p6.5f 2F* → 4p6.6d 2D | Misurata | NIST | |
| 468.7277 nm | 22 | Mo V | emission | 4p6.4d.(2D<5/2>).6s 2[5/2] → 4p6.4d.6p 3D* | Misurata | NIST | |
| 474.6519 nm | 8000 | Mo VI | emission | 4p6.5f 2F* → 4p6.6d 2D | Misurata | NIST | |
| 504.622 nm | N/D | Mo VI | emission | 4p6.7g 2G → 4p6.8h 2H* | Misurata | NIST | |
| 504.622 nm | N/D | Mo VI | emission | 4p6.7g 2G → 4p6.8h 2H* | Misurata | NIST | |
| 524.749 nm | N/D | Mo VI | emission | 4p6.7h 2H* → 4p6.8i 2I | Misurata | NIST | |
| 524.749 nm | N/D | Mo VI | emission | 4p6.7h 2H* → 4p6.8i 2I | Misurata | NIST | |
| 527.675 nm | N/D | Mo VI | emission | 4p6.7i 2I → 4p6.8k 2K* | Misurata | NIST | |
| 527.675 nm | N/D | Mo VI | emission | 4p6.7i 2I → 4p6.8k 2K* | Misurata | NIST | |
| 558.5 nm | 200 | Mo VI | emission | 4p6.8d 2D → 4p6.8f 2F* | Misurata | NIST | |
| 562 nm | 350 | Mo VI | emission | 4p6.8d 2D → 4p6.8f 2F* | Misurata | NIST | |
| 587.138 nm | 300 | Mo VI | emission | 4p6.7d 2D → 4p6.8p 2P* | Misurata | NIST | |
| 603.562 nm | 10 | Mo VI | emission | 4p6.4f 2F* → 4p6.5d 2D | Misurata | NIST | |
| 618.867 nm | 1400 | Mo VI | emission | 4p6.4f 2F* → 4p6.5d 2D | Misurata | NIST | |
| 633.604 nm | 1000 | Mo VI | emission | 4p6.4f 2F* → 4p6.5d 2D | Misurata | NIST |
Proprietà estese
Raggi covalenti (dati estesi)
- Raggio covalente (Pyykkö)
- 138 pm
- Raggio covalente (Pyykkö, legame doppio)
- 121 pm
- Raggio covalente (Pyykkö, legame triplo)
- 113 pm
Raggi di van der Waals
- Batsanov
- 210 pm
- Alvarez
- 245 pm
- UFF
- 305,2 pm
- MM3
- 239 pm
Raggi atomici e metallici
- Raggio atomico (Rahm)
- 244 pm
- Raggio metallico (C12)
- 139 pm
Scale di numerazione
- Mendeleev
- 52
- Pettifor
- 55
- Glawe
- 56
Scale di elettronegatività
- Ghosh
- 0
- Miedema
- 5
- Gunnarsson–Lundqvist
- 4
- Robles–Bartolotti
- 2
Polarizzabilità e dispersione
- Polarizzabilità dipolare
- 87 a.u.
- Polarizzabilità dipolare (inc.)
- 6 a.u.
- C₆ (Gould–Bučko)
- 1030 Ha·Bohr6
Parametri di Miedema
- Volume molare di Miedema
- 9,4 cm3/mol
- Densità elettronica di Miedema
- 6
Rischio di approvvigionamento ed economia
- Concentrazione della produzione
- 40
- Rischio relativo di approvvigionamento
- 9
- Distribuzione delle riserve
- 43
- Stabilità politica (principale produttore)
- 24
- Stabilità politica (principale detentore di riserve)
- 24
Transizioni di fase e allotropi
| Punto di fusione | 2895,15 K |
| Punto di ebollizione | 4912,15 K |
Categorie degli stati di ossidazione
Dati di riferimento avanzati
Costanti di schermaggio (10)
| n | Orbitale | σ |
|---|---|---|
| 1 | s | 0,8744 |
| 2 | p | 4,0282 |
| 2 | s | 11,1232 |
| 3 | d | 14,7717 |
| 3 | p | 16,5264 |
| 3 | s | 16,0185 |
| 4 | d | 30,6076 |
| 4 | p | 27,0232 |
| 4 | s | 25,9036 |
| 5 | s | 35,894 |
Dettaglio dei raggi cristallini (8)
| Carica | CN | Spin | rcrystal (pm) | Origine |
|---|---|---|---|---|
| 3 | VI | 83 | estimated, | |
| 4 | VI | 79 | from r^3 vs V plots, from metallic oxides, | |
| 5 | IV | 60 | from r^3 vs V plots, | |
| 5 | VI | 75 | from r^3 vs V plots, | |
| 6 | IV | 55 | from r^3 vs V plots, | |
| 6 | V | 64 | ||
| 6 | VI | 73 | from r^3 vs V plots, | |
| 6 | VII | 87 |
Modalità di decadimento degli isotopi (58)
| Isotopo | Modalità | Intensità |
|---|---|---|
| 81 | B+ | — |
| 81 | B+p | — |
| 82 | B+ | — |
| 82 | B+p | — |
| 83 | B+ | 100% |
| 83 | B+p | — |
| 84 | B+ | 100% |
| 84 | B+p | — |
| 85 | B+ | 100% |
| 85 | B+p | 0,1% |
Fattori di diffusione dei raggi X (909)
| Energia (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 2,2382 |
| 10,1447 | — | 2,20464 |
| 10,3088 | — | 2,17288 |
| 10,4756 | — | 2,14408 |
| 10,645 | — | 2,11566 |
| 10,8172 | — | 2,09307 |
| 10,9921 | — | 2,12057 |
| 11,1699 | — | 2,20711 |
| 11,3506 | — | 2,32651 |
| 11,5342 | — | 2,50051 |
Dati aggiuntivi
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
1.2 milligrams per kilogram
Riferimenti (1)
- [5] Molybdenum https://education.jlab.org/itselemental/ele042.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
1×10-2 milligrams per liter
Riferimenti (1)
- [5] Molybdenum https://education.jlab.org/itselemental/ele042.html
Sources
Sources of this element.
Molybdenum is also recovered as a by-product of copper and tungsten mining operations. The metal is prepared from the powder made by the hydrogen reduction of purified molybdic trioxide or ammonium molybdate.
Riferimenti (1)
- [6] Molybdenum https://periodic.lanl.gov/42.shtml
Riferimenti
(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 Molybdenum.
The element property data was retrieved from publications.