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17Cl35.45
Chlorine
HalogensBlock pPeriod 3Group 17gas at 20 °C
Configuration :[Ne] 3s² 3p⁵
Atomic mass :35.45 u
French :Chlore
3D Bohr-model representation of the Chlorine atom (symbol Cl, atomic number Z=17). Electron shell configuration: 2, 8, 7 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁵
Short[Ne] 3s² 3p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M7
Electronegativity
Pauling3.16
Allen2.869
Mulliken (eV)—
Atomic radii
Empirical100 pm
Calculated79 pm
Covalent102 pm
Van der Waals175 pm
Ionic radii (Shannon-Prewitt)
-1181 pm
Successive ionisation energies
I₁1251.2 kJ/mol
I₂2298 kJ/mol
I₃3822 kJ/mol
I₄5158.6 kJ/mol
I₅6542 kJ/mol
Electron affinity349 kJ/mol
Oxidation states
-1+1+2+3+4+5+6+7
Bold states = most common.