Argon vs Ruthenium
| Property | Ar Argon | Ru Ruthenium |
|---|---|---|
| Atomic number | 18 | 44 |
| Symbol | Ar | Ru |
| Name | Argon | Ruthenium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 39.948 u | 101.07 u |
| Period | 3 | 5 |
| Group | 18 | 8 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p6 | [Kr]5s14d7 |
| Oxidation states | [0] | [-4, -2, 1, 2, 3, 4, 5, 6, 7, 8] |
| Electronegativity (Pauling) | N/A | 2.2 |
| Electron affinity | -1 eV | 1.05 eV |
| Density | 1.7837 kg/m³ | 1.210000e+4 kg/m³ |
| Melting point | -189.35 °C | 2333.85 °C |
| Boiling point | -185.85 °C | 4149.85 °C |
| Discovery year | 1894 | 1828 |