Boron vs Astatine
| Property | B Boron | At Astatine |
|---|---|---|
| Atomic number | 5 | 85 |
| Symbol | B | At |
| Name | Boron | Astatine |
| Category | metalloid | halogen |
| Standard Atomic Weight | 10.8135 u | 210 u |
| Period | 2 | 6 |
| Group | 13 | 17 |
| Block | p | p |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s22p1 | [Xe]6s24f145d106p5 |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 2.04 | 2.2 |
| Electron affinity | 0.27972 eV | 2.391 eV |
| Density | 2370 kg/m³ | 7000 kg/m³ |
| Melting point | 2074.85 °C | 301.85 °C |
| Boiling point | 3999.85 °C | -273.15 °C |
| Discovery year | 1808 | 1940 |