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35Br79.904
Bromine
HalogensBlock pPeriod 4Group 17liquid at 20 °C
Configuration :[Ar] 3d¹⁰ 4s² 4p⁵
Atomic mass :79.904 u
French :Brome
3D Bohr-model representation of the Bromine atom (symbol Br, atomic number Z=35). Electron shell configuration: 2, 8, 18, 7 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Short[Ar] 3d¹⁰ 4s² 4p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N7
Electronegativity
Pauling2.96
Allen2.685
Mulliken (eV)—
Atomic radii
Empirical115 pm
Calculated94 pm
Covalent120 pm
Van der Waals185 pm
Ionic radii (Shannon-Prewitt)
-1196 pm
Successive ionisation energies
I₁1139.9 kJ/mol
I₂2103 kJ/mol
I₃3470 kJ/mol
I₄4560 kJ/mol
I₅5760 kJ/mol
Electron affinity324.6 kJ/mol
Oxidation states
-1+1+3+4+5+7
Bold states = most common.