Rubidium vs Radon
| Property | Rb Rubidium | Rn Radon |
|---|---|---|
| Atomic number | 37 | 86 |
| Symbol | Rb | Rn |
| Name | Rubidium | Radon |
| Category | alkali-metal | noble-gas |
| Standard Atomic Weight | 85.4678 u | 222 u |
| Period | 5 | 6 |
| Group | 1 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Kr]5s1 | [Xe]6s24f145d106p6 |
| Oxidation states | [-1, 1] | [0, 2, 6] |
| Electronegativity (Pauling) | 0.82 | N/A |
| Electron affinity | 0.4859 eV | -0.7 eV |
| Density | 1530 kg/m³ | 9.73 kg/m³ |
| Melting point | 39.31 °C | -71.15 °C |
| Boiling point | 687.85 °C | -61.7 °C |
| Discovery year | 1861 | 1900 |