76Os190.23
Osmium (Os)
Element 76 · Transition metal
Osmium (Os) is a chemical element with atomic number 76. It is classified as a transition metal in period 6, group 8 of the periodic table (the d-block). Its standard atomic weight is 190.23 u and its ground-state electron configuration is [Xe] 4f¹⁴ 5d⁶ 6s².
Osmium facts
| Atomic number (Z) | 76 |
|---|---|
| Symbol | Os |
| Standard atomic weight | 190.23 u |
| Category | Transition metal |
| Group | 8 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d⁶ 6s² |
| Electronegativity (Pauling) | 2.2 |
| State at 20 °C | Solid |
| Protons / electrons | 76 / 76 |
| Neutrons (most common isotope, approx.) | 114 |
| Molar mass | 190.23 g/mol |