| At | Astatine | Halogen |
| Atomic number: | 85 | Atomic weight: | (209.9871) | ||
| Shells: | 2,8,18,32,18,7 | Orbitals: | [Xe] 4f14 5d10 6s2 6p5 | ||
| Melting point: | 302°C | Boiling point: | 337°C | ||
| Covalent radius: | 1.45 | Å | Atomic volume: | -- | cm³/mol |
| Atomic radius: | 1.43 | Å | Ionic radius: | -- | Å |
| Electronegativity: | 2.2 | Oxidation states: | (±1),3,5,7 | ||
| 1st ionization pot.: | 9.5 | V | 2nd ionization pot.: | -- | V |
| 3rd ionization pot.: | -- | V | Specific heat: | -- | J/gK |
| Heat of fusion: | -- | kJ/mol | Heat of vapor.: | -- | kJ/mol |
| Thermal conduct.: | 0.017 | W/cmK | Electrical conduct.: | -- | 10^6/cm ohm |
| Density: | -- | g/cm³ | Valence: | 1,3,5,7 |