Oxygen vs Radon
| Property | O Oxygen | Rn Radon |
|---|---|---|
| Atomic number | 8 | 86 |
| Symbol | O | Rn |
| Name | Oxygen | Radon |
| Category | nonmetal | noble-gas |
| Standard Atomic Weight | 15.9994 u | 222 u |
| Period | 2 | 6 |
| Group | 16 | 18 |
| Block | p | p |
| Phase at STP | gas | gas |
| Electron configuration | [He]2s22p4 | [Xe]6s24f145d106p6 |
| Oxidation states | [-2, -1, 0, 1, 2] | [0, 2, 6] |
| Electronegativity (Pauling) | 3.44 | N/A |
| Electron affinity | 1.4611 eV | -0.7 eV |
| Density | 1.429 kg/m³ | 9.73 kg/m³ |
| Melting point | -218.79 °C | -71.15 °C |
| Boiling point | -182.95 °C | -61.7 °C |
| Discovery year | 1771 | 1900 |