Polonium vs Astatine
| Property | Po Polonium | At Astatine |
|---|---|---|
| Atomic number | 84 | 85 |
| Symbol | Po | At |
| Name | Polonium | Astatine |
| Category | metalloid | halogen |
| Standard Atomic Weight | 209 u | 210 u |
| Period | 6 | 6 |
| Group | 16 | 17 |
| Block | p | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p4 | [Xe]6s24f145d106p5 |
| Oxidation states | [-2, 2, 4, 5, 6] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 2 | 2.2 |
| Electron affinity | 1.9 eV | 2.391 eV |
| Density | 9320 kg/m³ | 7000 kg/m³ |
| Melting point | 253.85 °C | 301.85 °C |
| Boiling point | 961.85 °C | -273.15 °C |
| Discovery year | 1898 | 1940 |