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Molybdenum
Metal Properties - Condensed:
| PROPERTY |
| Atomic Number
|
42 |
| Atomic Weight
|
95.94 |
| Density (20°C)
|
10.22 g/CC |
| Melting Point
|
2896 K, 2610°C, 4753°Fm |
| Boiling Point
|
4912 K, 5560°C, 8382°F |
| Coefficient of Thermal Expansion (20°C)
|
4.9 x 10-6/°C |
| Electrical Resistivity (20°C)
|
5.7 microhms-cm |
| Electrical Conductivity
|
30% IACS |
| Specific Heat
|
.061 cal/g/°C |
| Thermal Conductivity
|
.35 cal/cm2/cm°C/sec |
| Modulus of Elasticity (20°C)
|
46 x 106 psi |
Molybdenum Metal Properties
- Extended
|
General |
|
Name, Symbol, Number |
molybdenum, Mo, 42 |
|
Chemical series |
transition metals |
|
Group, Period, Block |
6, 5, d |
|
Atomic mass |
95.94(2) g/mol |
|
Electron configuration |
[Kr] 4d5 5s1 |
|
Electrons per shell |
2, 8, 18, 13, 1 |
|
Physical properties |
|
Phase |
solid |
|
Density (near r.t.) |
10.28 g·cm−3 |
|
Liquid density at m.p. |
9.33 g·cm−3 |
|
Melting point |
2896 K |
|
(2623 °C, 4753 °F) |
|
Boiling point |
4912 K |
|
(4639 °C, 8382 °F) |
|
Heat of fusion |
37.48 kJ·mol−1 |
|
Heat of vaporization |
617 kJ·mol−1 |
|
Heat capacity |
(25 °C) 24.06 J·mol−1·K−1 |
|
Vapor pressure |
|
P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
|
at T/K |
2742 |
2994 |
3312 |
3707 |
4212 |
4879 |
|
|
|
Atomic properties |
|
Crystal structure |
cubic body centered |
|
Oxidation states |
2, 3, 4, 5, 6 |
|
(strongly acidic oxide) |
|
Electronegativity |
2.16 (Pauling scale) |
|
Ionization energies |
1st: 684.3 kJ·mol−1 |
|
(more) |
2nd: 1560 kJ·mol−1 |
|
|
3rd: 2618 kJ·mol−1 |
|
Atomic radius |
145 pm |
|
Atomic radius (calc.) |
190 pm |
|
Covalent radius |
145 pm |
|
Miscellaneous |
|
Magnetic ordering |
no data |
|
Electrical resistivity |
(20 °C) 53.4 nΩ·m |
|
Thermal conductivity |
(300 K) 138 W·m−1·K−1 |
|
Thermal expansion |
(25 °C) 4.8 µm·m−1·K−1 |
|
Speed of sound (thin rod) |
(r.t.) 5400 m·s−1 |
|
Young's modulus |
329 GPa |
|
Shear modulus |
20 GPa |
|
Bulk modulus |
230 GPa |
|
Poisson ratio |
0.31 |
|
Mohs hardness |
5.5 |
|
Vickers hardness |
1530 MPa |
|
Brinell hardness |
1500 MPa |
|
CAS registry number |
7439-98-7 |
|
Notable isotopes |
|
Main article: Isotopes of molybdenum |
|
|
iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
|
|
92Mo |
14.84% |
Mo is stable with 50 neutrons |
|
|
93Mo |
syn |
4×103 y |
ε |
- |
93Nb |
|
|
94Mo |
9.25% |
Mo is stable with 52 neutrons |
|
|
95Mo |
15.92% |
Mo is stable with 53 neutrons |
|
|
96Mo |
16.68% |
Mo is stable with 54 neutrons |
|
|
97Mo |
9.55% |
Mo is stable with 55 neutrons |
|
|
98Mo |
24.13% |
Mo is stable with 56 neutrons |
|
|
99Mo |
syn |
65.94 h |
β- |
0.436, 1.214 |
99Tc |
|
|
γ |
0.74, 0.36, |
- |
|
|
0.14 |
|
|
100Mo |
9.63% |
7.8×1018 y |
β-β- |
? |
100Ru |
|
|
Source: Wikipedia http://en.wikipedia.org/wiki/Molybdenum
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