| Attribute | Value |
|---|---|
| Symbol | At |
| Standard state | Solid |
| Atomic mass | 209.98715 u |
| Electron configuration | [Xe]6s²4f¹⁴5d¹⁰6p⁵ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 2.2 |
| Atomic radius (van der waals) | 202 pm |
| Ionization energy | 9.5 eV |
| Electron affinity | 2.8 eV |
| Melting point | 575 K |
| Density | 7 g/cm³ |
| Atomic number | 85 |
| Group name | Halogen |
| Discovered | 1940 year |
| Boiling point | Add |