Selenium vs Xenon
| Property | Se Selenium | Xe Xenon |
|---|---|---|
| Atomic number | 34 | 54 |
| Symbol | Se | Xe |
| Name | Selenium | Xenon |
| Category | nonmetal | noble-gas |
| Standard Atomic Weight | 78.971 u | 131.293 u |
| Period | 4 | 5 |
| Group | 16 | 18 |
| Block | p | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ar]4s23d104p4 | [Kr]5s24d105p6 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [0, 2, 4, 6, 8] |
| Electronegativity (Pauling) | 2.55 | 2.6 |
| Electron affinity | 2.0206 eV | -0.8 eV |
| Density | 4809 kg/m³ | 5.887 kg/m³ |
| Melting point | 220.5 °C | -111.79 °C |
| Boiling point | 684.85 °C | -108.1 °C |
| Discovery year | 1817 | 1898 |