| Property | Value |
|---|---|
| Atomic number | 76 |
| Atomic weight | 190.233 amu |
| Element family | Transition metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 187Os: 1.6%, 188Os: 13.3%, 189Os: 16.1%, 190Os: 26.4%, 192Os: 41.0% |
| Previous element | Rhenium |
| Next element | Iridium |
| Density | 22.61 g/cm3 (STP) |
| Melting | 3027 °C |
| Boiling | 5027 °C |
| Covalent radius | 1.29 Å |
| Ionic radius | 0.63 Å |
| Metallic radius | 1.35 Å |
| First ionization potential | 8.706 eV |
| Electron affinity | 1.078 eV |
| Electronegativity | 2.2 |
| Discovery year | 1803 |
Osmium is an element number 76 from transition metals family. Its symbol is Os. Osmium atomic weight is 190.233 amu. Os stable and long lived isotopes are 187Os: 1.6%, 188Os: 13.3%, 189Os: 16.1%, 190Os: 26.4%, 192Os: 41.0%. Osmium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p66s25d6. Sample compounds that contain Osmium are OsO4, OsH4.
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