Argon vs Polonium
| Property | Ar Argon | Po Polonium |
|---|---|---|
| Atomic number | 18 | 84 |
| Symbol | Ar | Po |
| Name | Argon | Polonium |
| Category | noble-gas | metalloid |
| Standard Atomic Weight | 39.948 u | 209 u |
| Period | 3 | 6 |
| Group | 18 | 16 |
| Block | p | p |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p6 | [Xe]6s24f145d106p4 |
| Oxidation states | [0] | [-2, 2, 4, 5, 6] |
| Electronegativity (Pauling) | N/A | 2 |
| Electron affinity | -1 eV | 1.9 eV |
| Density | 1.7837 kg/m³ | 9320 kg/m³ |
| Melting point | -189.35 °C | 253.85 °C |
| Boiling point | -185.85 °C | 961.85 °C |
| Discovery year | 1894 | 1898 |