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Astatine (At)
Atomic number 85 · Halogen
| Atomic number | 85 |
|---|---|
| Atomic mass | 210.0 u |
| Molar mass | 210.0 g/mol |
| Category | Halogen |
| Group / period / block | 17 / 6 / p |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p5 |
| Electrons per shell | 2, 8, 18, 32, 18, 7 |
| Electronegativity (Pauling) | 2.2 |
| Density | 7.0 g/cm³ |
| First ionisation energy | 9.3175 eV |
| Melting point | 575.15 K (302.00 °C) |
| Common oxidation states | -1, +1 |
Uses
Research, possible cancer therapy
Discovery
1940, D.R.Corson, K.R.MacKenzie, E.Segré