Osmium (Os)
Osmium is the chemical element with atomic number 76 and symbol Os. It is a métal de transition in period 6, group 8, with a standard atomic weight of 190.23 u.
Faits essentiels
- Z
- 76
- Atomic weight
- 190.23 u
- Category
- métal de transition
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1804
- CAS
- 7440-04-2
Propriétés mesurées
| Property | Value | Source |
|---|---|---|
| Electronegativity | 2.2 | National Center for Biotechnology Information (NIH) |
| Melting point | 3,306 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 5,285 K | National Center for Biotechnology Information (NIH) |
| Density stp | 22.57 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 216 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 839.4 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 106.1 kJ/mol | National Center for Biotechnology Information (NIH) |
Configuration électronique
- Noble gas notation
- [Xe] 4f¹⁴ 5d⁶ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁶ 6s²
- Electrons per shell
- 2, 8, 18, 32, 14, 2