85
At
Astatine
Halogen period 6 group 17 p-block discovered: 1940
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 85
- Atomic mass
- 209.98715 a.m.u.
- Electron configuration
- [Xe]6s2 4f14 5d10 6p5
- Electronegativity
- 2.2 on the Pauling scale
- Atomic radius
- 202 pm
- Ionization energy
- 9.5 eV
- Electron affinity
- 2.8 eV
- Oxidation states
- 7, 5, 3, 1, -1
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 575 K (301,85 °C)
- Density
- 7 g/cm³