| Attribute | Value |
|---|---|
| Symbol | Os |
| Standard state | Solid |
| Atomic mass | 190.2 u |
| Electron configuration | [Xe]6s²4f¹⁴5d⁶ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 2.2 |
| Atomic radius (van der waals) | 216 pm |
| Ionization energy | 8.7 eV |
| Electron affinity | 1.1 eV |
| Melting point | 3306 K |
| Boiling point | 5285 K |
| Density | 22.57 g/cm³ |
| Atomic number | 76 |
| Group name | Transition metal |
| Discovered | 1803 year |