20Ca40.078
Calcium
Alkaline earth metalsBlock sPeriod 4Group 2solid at 20 °C
Configuration :[Ar] 4s²
Atomic mass :40.078 u
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Modèle de Bohr · pédagogique
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
Short[Ar] 4s²
Valence electrons2
KLMNOPQ shells
K2
L8
M8
N2
Electronegativity
Pauling1
Allen1.034
Mulliken (eV)—
Atomic radii
Empirical180 pm
Calculated194 pm
Covalent176 pm
Van der Waals231 pm
Ionic radii (Shannon-Prewitt)
+2100 pm
Successive ionisation energies
I₁589.8 kJ/mol
I₂1145.4 kJ/mol
I₃4912.4 kJ/mol
I₄6491 kJ/mol
I₅8153 kJ/mol
Electron affinity2.37 kJ/mol
Oxidation states
+1+2
Bold states = most common.