Argon vs Radon
| Property | Ar Argon | Rn Radon |
|---|---|---|
| Atomic number | 18 | 86 |
| Symbol | Ar | Rn |
| Name | Argon | Radon |
| Category | noble-gas | noble-gas |
| Standard Atomic Weight | 39.948 u | 222 u |
| Period | 3 | 6 |
| Group | 18 | 18 |
| Block | p | p |
| Phase at STP | gas | gas |
| Electron configuration | [Ne]3s23p6 | [Xe]6s24f145d106p6 |
| Oxidation states | [0] | [0, 2, 6] |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | -1 eV | -0.7 eV |
| Density | 1.7837 kg/m³ | 9.73 kg/m³ |
| Melting point | -189.35 °C | -71.15 °C |
| Boiling point | -185.85 °C | -61.7 °C |
| Discovery year | 1894 | 1900 |