Atomic Properties
- Atomic Number
- 76
- Atomic Mass
- 190.2300 u
- Electron Configuration
- [Xe] 4f14 5d6 6s2
- Electronegativity
- 2.20
- Block
- d-block
- Group
- 8
- Period
- 6
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 3306.00 K
- Boiling Point
- 5285.00 K
- Density
- 22.5900 g/cm³
About Osmium
Densest naturally occurring element; used in pen tips and electrical contacts.
Isotopes of Osmium
Osmium has 7 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 184Os | 184 | 183.9524885 | 0.0200% | Stable |
| 186Os | 186 | 185.953835 | 1.590% | Stable |
| 187Os | 187 | 186.9557474 | 1.960% | Stable |
| 188Os | 188 | 187.9558352 | 13.24% | Stable |
| 189Os | 189 | 188.9581442 | 16.15% | Stable |
| 190Os | 190 | 189.9584437 | 26.26% | Stable |
| 192Os | 192 | 191.961477 | 40.78% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)