Argon vs Xenon
| Property | Ar Argon | Xe Xenon |
|---|---|---|
| Atomic number | 18 | 54 |
| Symbol | Ar | Xe |
| Name | Argon | Xenon |
| Category | noble-gas | noble-gas |
| Standard Atomic Weight | 39.948 u | 131.293 u |
| Period | 3 | 5 |
| Group | 18 | 18 |
| Block | p | p |
| Phase at STP | gas | gas |
| Electron configuration | [Ne]3s23p6 | [Kr]5s24d105p6 |
| Oxidation states | [0] | [0, 2, 4, 6, 8] |
| Electronegativity (Pauling) | N/A | 2.6 |
| Electron affinity | -1 eV | -0.8 eV |
| Density | 1.7837 kg/m³ | 5.887 kg/m³ |
| Melting point | -189.35 °C | -111.79 °C |
| Boiling point | -185.85 °C | -108.1 °C |
| Discovery year | 1894 | 1898 |