Atomic number 85
Astatine
Halogen
Quick facts
- Atomic mass
- 210.00
- Group
- 17
- Period
- 6
- State (STP)
- unknown
- Electronegativity
- 2.20
- Common ox. states
- -1, +1, +3, +5, +7
Properties
Electron configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
- Ionization energy
- 899.0 kJ/mol
- Electron affinity
- 233.0 kJ/mol
- Melting point
- 575.00 K (301.9 °C)
- Boiling point
- 610.00 K (336.9 °C)
How it bonds
Astatine is the rarest naturally occurring element on Earth (less than 30 g exists in the entire crust at any time). Predicted to behave like iodine — one bond, 3 lone pairs — but no one has ever seen a macroscopic amount. All isotopes are radioactive with short half-lives.