| Element | Osmium | Symbol | Os |
| Atomic Number | 76 | Molar Mass | 190.2 gmol-1 |
| Electron Configuration | [Xe]4f145d66s2 | Normal State | solid metal |
| Density @STP | 22.58 g cm-3 | Melting Point | 3033oC |
| Boiling Point | 5012oC | Stable Isotopes | 184Os, 186Os, 187Os, 188Os, 189Os, 190Os, 192Os |
| Atomic Radius | 135 pm | Ionic Radius | 81 (3+) pm |
| Electronegativity (Pauling) | 2.2 | Ionization Energy (1st) | 840 kJ mol-1 |
| Ionization Energy (2nd) | 1600 kJ mol-1 | Ionization Energy (3rd) | 2400 kJ mol-1 |
| Molar Heat Capacity | 24.7 J K-1mol-1 | Standard Molar Entropy | 32.6 J K-1mol-1 |
| Enthalpy of Fusion | 29.3 kJ mol-1 | Enthalpy of Vapourization | 627.6 kJ mol-1 |