Osmium |
| Symbol | Os |
|---|---|
| Latin name | Osmium |
| Atomic number | 76 |
| Period | 6 |
| Element category | Transition elements |
| Relative atomic mass | 190.2 |
| Group | VIII.B |
| Electronegativity | 2.2 |
| Oxidation numbers | 2, 3, 4, 6, 8 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d6 6s2 |
| Density [g/cm3] | 22.6 |
| State | Solid |
| Melting point [°C] | 3045 |
| Boiling point [°C] | 5000 |
| Atomic radius [pm] | 185 |
| Covalent radius [pm] | 128 |
| Thermal conductivity [W m-1K-1] | 87.6 |
| Heat capacity [J K-1g-1] | 0.13 |
| Discovery | 1803 |
| Hardness [Mohs scale] | 8.0 |
| Brinell hardness [MPa] | 3920 |
| Electrical conductivity [S m-1] | 1.23 · 107 |
| Shear modulus [GPa] | 222 |
| 1.st ionization energy [eV] | 8.7 |
| Stable isotopes | 7 |
| Unstable isotopes | 12 |