Lanthanum vs Astatine
| Property | La Lanthanum | At Astatine |
|---|---|---|
| Atomic number | 57 | 85 |
| Symbol | La | At |
| Name | Lanthanum | Astatine |
| Category | lanthanide | halogen |
| Standard Atomic Weight | 138.90547 u | 210 u |
| Period | 6 | 6 |
| Group | N/A | 17 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s25d1 | [Xe]6s24f145d106p5 |
| Oxidation states | [0, 1, 2, 3] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 1.1 | 2.2 |
| Electron affinity | 0.47 eV | 2.391 eV |
| Density | 6150 kg/m³ | 7000 kg/m³ |
| Melting point | 917.85 °C | 301.85 °C |
| Boiling point | 3463.85 °C | -273.15 °C |
| Discovery year | 1839 | 1940 |