Astatine is a highly radioactive, silvery-gray halogen from the periodic table. It is extremely rare and is found only in trace amounts in nature. Astatine is used in the production of nuclear energy and in medical diagnosis and treatment.
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| Atomic number | 85 |
| Group | VIIA |
| Period | 6 |
| Mass | 210 |
| Latin name | Astatum |
| Electron configuration | [Hg]6p5 |
| Oxidation state | -1, 0, 1, 3, 5, 7 |