76 Os
Transition metal
Osmium
Densest natural element.
Properties of Osmium
- Atomic number (Z)
- 76
- Symbol
- Os
- Atomic mass
- 190.23 g/mol
- Category
- Transition metal
- Group
- 8
- Period
- 6
- Electron configuration
- [Xe] 4f¹⁴ 5d⁶ 6s²
- Electronegativity (Pauling)
- 2.2
- Atomic radius
- 185 pm
- First ionization energy
- 840 kJ/mol
- Melting point
- 3306 K (3032.8 °C)
- Boiling point
- 5285 K (5011.9 °C)
- Density
- 22.61 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1803