Ruthenium vs Osmium
| Property | Ru Ruthenium | Os Osmium |
|---|---|---|
| Atomic number | 44 | 76 |
| Symbol | Ru | Os |
| Name | Ruthenium | Osmium |
| Category | transition-metal | transition-metal |
| Standard Atomic Weight | 101.07 u | 190.23 u |
| Period | 5 | 6 |
| Group | 8 | 8 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s14d7 | [Xe]6s24f145d6 |
| Oxidation states | [-4, -2, 1, 2, 3, 4, 5, 6, 7, 8] | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8] |
| Electronegativity (Pauling) | 2.2 | 2.2 |
| Electron affinity | 1.05 eV | 1.1 eV |
| Density | 1.210000e+4 kg/m³ | 2.258720e+4 kg/m³ |
| Melting point | 2333.85 °C | 3032.85 °C |
| Boiling point | 4149.85 °C | 5011.85 °C |
| Discovery year | 1828 | 1803 |