Polonium vs Radium
| Property | Po Polonium | Ra Radium |
|---|---|---|
| Atomic number | 84 | 88 |
| Symbol | Po | Ra |
| Name | Polonium | Radium |
| Category | metalloid | alkaline-earth-metal |
| Standard Atomic Weight | 209 u | 226 u |
| Period | 6 | 7 |
| Group | 16 | 2 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p4 | [Rn]7s2 |
| Oxidation states | [-2, 2, 4, 5, 6] | [2] |
| Electronegativity (Pauling) | 2 | 0.9 |
| Electron affinity | 1.9 eV | 0.096 eV |
| Density | 9320 kg/m³ | 5000 kg/m³ |
| Melting point | 253.85 °C | 699.85 °C |
| Boiling point | 961.85 °C | 1139.85 °C |
| Discovery year | 1898 | 1898 |