Xenon vs Neptunium
| Property | Xe Xenon | Np Neptunium |
|---|---|---|
| Atomic number | 54 | 93 |
| Symbol | Xe | Np |
| Name | Xenon | Neptunium |
| Category | noble-gas | actinide |
| Standard Atomic Weight | 131.293 u | 237 u |
| Period | 5 | 7 |
| Group | 18 | N/A |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Kr]5s24d105p6 | [Rn]7s25f46d1 |
| Oxidation states | [0, 2, 4, 6, 8] | [2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 2.6 | 1.36 |
| Electron affinity | -0.8 eV | 0.48 eV |
| Density | 5.887 kg/m³ | 2.025000e+4 kg/m³ |
| Melting point | -111.79 °C | 643.85 °C |
| Boiling point | -108.1 °C | 3901.85 °C |
| Discovery year | 1898 | 1940 |