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|
Osmium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Os | 76 | 190.23 | 3033 °C | 5012 °C | Solid | 22.61 g/cm3 | Noble Metal |
|
|
|
| General |
| Name, Symbol, Number |
osmium, Os, 76 |
| Chemical series |
transition metals |
| Group, Period, Block |
8, 6, d |
| Appearance |
silvery, blue cast
 |
| Standard atomic weight |
190.23(3) g·mol−1 |
| Electron configuration |
[Xe] 4f14 5d6 6s2 |
| Electrons per shell |
2, 8, 18, 32, 14, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
22.61 g·cm−3 |
| Liquid density at m.p. |
20 g·cm−3 |
| Melting point |
3306 K
(3033 °C, 5491 °F) |
| Boiling point |
5285 K
(5012 °C, 9054 °F) |
| Heat of fusion |
57.85 kJ·mol−1 |
| Heat of vaporization |
738 kJ·mol−1 |
| Heat capacity |
(25 °C) 24.7 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
3160 |
3423 |
3751 |
4148 |
4638 |
5256 |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
8, 7, 6, 5, 4, 3, 2, 1, −1, −2
(mildly acidic oxide) |
| Electronegativity |
2.2 (scale Pauling) |
| Ionization energies |
1st: 840 kJ/mol |
| 2nd: 1600 kJ/mol |
| Atomic radius |
130 pm |
| Atomic radius (calc.) |
185 pm |
| Covalent radius |
128 pm |
| Miscellaneous |
| Magnetic ordering |
? |
| Electrical resistivity |
(0 °C) 81.2 nΩ·m |
| Thermal conductivity |
(300 K) 87.6 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 5.1 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 4940 m/s |
| Shear modulus |
222 GPa |
| Poisson ratio |
0.25 |
| Bulk modulus |
462 GPa |
| Mohs hardness |
7.0 |
| Brinell hardness |
3920 MPa |
| CAS registry number |
7440-04-2 |
| Selected isotopes |
|
|
| References |
|
Osmium Compounds
|
Source: Wikipedia article Osmium
|
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Chemistry Quick Facts
