Xenon vs Promethium
| Property | Xe Xenon | Pm Promethium |
|---|---|---|
| Atomic number | 54 | 61 |
| Symbol | Xe | Pm |
| Name | Xenon | Promethium |
| Category | noble-gas | lanthanide |
| Standard Atomic Weight | 131.293 u | 145 u |
| Period | 5 | 6 |
| Group | 18 | N/A |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Kr]5s24d105p6 | [Xe]6s24f5 |
| Oxidation states | [0, 2, 4, 6, 8] | [2, 3] |
| Electronegativity (Pauling) | 2.6 | N/A |
| Electron affinity | -0.8 eV | 0.129 eV |
| Density | 5.887 kg/m³ | 7260 kg/m³ |
| Melting point | -111.79 °C | 1041.85 °C |
| Boiling point | -108.1 °C | 2999.85 °C |
| Discovery year | 1898 | 1902 |