Periodic Table
85
At
210
Astatine
HalogenRarest naturally occurring element; radioactive halogen.
Electronic Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
18e⁻n=5
7e⁻n=6
Properties
Atomic number
85
Atomic mass
210 u
Category
Halogen
Block / Group / Period
p · 17 · 6
Valence electrons
7
Oxidation states
-1, +1
Electronegativity
2.2
Atomic radius
127 pm
Ionization energy
899 kJ/mol
Electron affinity
233 kJ/mol
Melting point
575 K / 302 °C
Boiling point
610 K / 337 °C
Density
7 g/cm³
State at 25 °C
solid
Personal Notes
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