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85At210
Astatine
HalogensBlock pPeriod 6Group 17solid at 20 °C
Configuration :[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Atomic mass :210 u
French :Astate
3D Bohr-model representation of the Astatine atom (symbol At, atomic number Z=85). Electron shell configuration: 2, 8, 18, 32, 18, 7 electrons.
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Bohr model · educational
Electron configuration
Full[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Short[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N32
O18
P7
Electronegativity
Pauling2.2
Allen—
Mulliken (eV)—
Atomic radii
Empirical127 pm
Calculated—
Covalent150 pm
Van der Waals202 pm
Successive ionisation energies
I₁899 kJ/mol
Electron affinity233 kJ/mol
Oxidation states
-1+1+3+5+7
Bold states = most common.