Astatine vs Radium
| Property | At Astatine | Ra Radium |
|---|---|---|
| Atomic number | 85 | 88 |
| Symbol | At | Ra |
| Name | Astatine | Radium |
| Category | halogen | alkaline-earth-metal |
| Standard Atomic Weight | 210 u | 226 u |
| Period | 6 | 7 |
| Group | 17 | 2 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p5 | [Rn]7s2 |
| Oxidation states | [-1, 1, 3, 5, 7] | [2] |
| Electronegativity (Pauling) | 2.2 | 0.9 |
| Electron affinity | 2.391 eV | 0.096 eV |
| Density | 7000 kg/m³ | 5000 kg/m³ |
| Melting point | 301.85 °C | 699.85 °C |
| Boiling point | -273.15 °C | 1139.85 °C |
| Discovery year | 1940 | 1898 |