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CAS: 7439-98-7 Description: Hard, silvery-white metal Classification: Transition Metal Date of Discovery: 1778 Discoverer: Carl Wilhelm Scheele Name Origin: Greek molybdos, "lead" |
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Atomic Number: 42
Number of Neutrons: 54 Atomic Mass: 95.94(1) amu Melting Point: 2623 °C Boiling Point: 4639 °C Density (293 K): 10.22 g/cm3 Atomic volume: 1.39 cm3/mol Electrical resistivity: 0.187 10-6/cm 
Thermal conductivity: 1.38 W/cmK Enthalpy of atomization: 653 kJ/mol (est.) Enthalpy of vaporization: 598.0 kJ/mol Enthalpy of fusion: 32.0 kJ/mol Specific heat capacity: 0.25 J/gK |
Energy levels: 2-8-18-13-1
Electron configuration: [Kr]4d55s1 Crystal Structure: Cubic body centered Atomic radius: 2.01 Å Covalent radius: 1.30 Å Oxidation States: +2, +3, +4(?), +5(?) and +6 Electronegativity, Pauling: 2.16 Electron affinity: 0.748 eV First ionization energy: 7.099 eV 2nd ionization energy: 16.461 eV 3rd ionization energy: 27.16 eV Polarizability: 12.8 10-24cm3 |
| Isotope | Natural Abundance | Atomic Mass | Half-life | Decay Mode | Spin |
| 84Mo | 83.9401 |  + |
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| 85Mo | 84.9366 | - |
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| 86Mo | 85.9302 | 20 s | + |
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| 87Mo | 86.9273 | 14 s | EC; + |
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| 88Mo | 87.92195 | 8.0 m | +; EC |
0+ | |
| 89mMo | 0.19 s | IT | 1/2- | ||
| 89Mo | 88.91948 | 2.2 m | +; EC |
9/2+ | |
| 90Mo | 89.91394 | 5.7 h | +; EC |
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| 91mMo | 1.08 m | IT; +, EC |
1/2- | ||
| 91Mo | 90.91175 | 15.5 m | +; EC |
9/2- | |
| 92Mo | 14.84(4) | 91.906810 | Stable | 0+ | |
| 93mMo | 6.9 h | IT | 9/2+ | ||
| 93Mo | 92.906811 | 3500 y | EC | 5/2+ | |
| 94Mo | 9.25(3) | 93.905087 | Stable | 0+ | |
| 95Mo | 15.92(5) | 94.905841 | Stable | 5/2+ | |
| 96Mo | 16.68(5) | 95.904678 | Stable | 0+ | |
| 97Mo | 9.55(3) | 96.906020 | Stable | 5/2+ | |
| 98Mo | 24.13(7) | 97.905407 | Stable | 0+ | |
| 99Mo | 98.907711 | 2.7476 d | - |
1/2+ | |
| 100Mo | 9.63(3) | 99.907488 | Stable | 0+ | |
| 101Mo | 100.91035 | 14.6 m | - |
1/2+ | |
| 102Mo | 101.91030 | 11.3 | - |
0+ | |
| 103Mo | 102.91320 | 1.13 m | - |
3/2+ | |
| 104Mo | 103.91376 | 1.00 m | - |
0+ | |
| 105Mo | 104.9170 | 36 s | - |
3/2+ | |
| 106Mo | 105.91814 | 8.4 s | - |
0+ | |
| 107Mo | 106.9217 | 3.5 s | - |
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| 108Mo | 107.9240 | 1.5 s | - |
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| 109Mo | 108.9277 | 0.5 s | - |
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| 110Mo | 109.9295 | 0.30 s | - |
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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 an impure form in 1782 by Hjelm. Molybdenum does not occur native, but is obtained principally from molybdenite (MoS2). Wulfenite (PbMoO4) and Powellite (Ca(MoW)O4) are also minor commercial ores. Molybdenum is also recovered as a by-product of copperand tungsten mining operations. The metal is prepared from the powder made by the hydrogen reduction of purified molybdic trioxide or ammonium molybdate. 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. It is used in certain nickel-based alloys, such as the "Hastelloys ®" 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 application 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 contain molybdenum in amounts from 0.25 to 8%. Natural molybdenum contains seven isotopes. Twenty-three other isotopes and isomers are known, all of which are radioactive.
LINKS: AMM Online - Molybdenum Profile Five Minutes With Moly International Molybdenum Association Molybdenum Infusion - New Technology for Steel Material Safety Data Sheet - Molybdenum Trace Mineral Overview Molybdenum Return
Sources for the information on this website include: Lide, David R., ed. CRC Handbook of Chemistry and Physics, 78th Ed., 1997-1998. |
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