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76
Os
190.23
Osmium
Transition metals · Group 8 · Period 6
Atomic properties
| Atomic number | 76 |
|---|---|
| Symbol | Os |
| Standard atomic weight | 190.23 |
| Classification | Transition metals |
| Group | 8 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f14 5d6 6s2 |
| Electronegativity (Pauling) | 2.20 |
| Common oxidation states | +4, +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 22.59 g/cm³ |
| Melting point | 3033 °C |
| Boiling point | 5012 °C |
| Discovered | 1803 |
| CAS number | — |