Oxygen vs Ruthenium
| Property | O Oxygen | Ru Ruthenium |
|---|---|---|
| Atomic number | 8 | 44 |
| Symbol | O | Ru |
| Name | Oxygen | Ruthenium |
| Category | nonmetal | transition-metal |
| Standard Atomic Weight | 15.9994 u | 101.07 u |
| Period | 2 | 5 |
| Group | 16 | 8 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p4 | [Kr]5s14d7 |
| Oxidation states | [-2, -1, 0, 1, 2] | [-4, -2, 1, 2, 3, 4, 5, 6, 7, 8] |
| Electronegativity (Pauling) | 3.44 | 2.2 |
| Electron affinity | 1.4611 eV | 1.05 eV |
| Density | 1.429 kg/m³ | 1.210000e+4 kg/m³ |
| Melting point | -218.79 °C | 2333.85 °C |
| Boiling point | -182.95 °C | 4149.85 °C |
| Discovery year | 1771 | 1828 |