Potassium
Block sPeriod 4Group 1solid at 20 °C
Configuration :[Ar] 4s¹
Atomic mass :39.0983 u
Latin :Kalium
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Modèle de Bohr · pédagogique
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
Short[Ar] 4s¹
Valence electrons1
KLMNOPQ shells
K2
L8
M8
N1
Electronegativity
Pauling0.82
Allen0.734
Mulliken (eV)—
Atomic radii
Empirical220 pm
Calculated243 pm
Covalent203 pm
Van der Waals275 pm
Ionic radii (Shannon-Prewitt)
+1138 pm
Successive ionisation energies
I₁418.8 kJ/mol
I₂3052 kJ/mol
I₃4420 kJ/mol
I₄5877 kJ/mol
I₅7975 kJ/mol
Electron affinity48.4 kJ/mol
Oxidation states
-1+1
Bold states = most common.