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12Mg24.305
Magnesium
Alkaline earth metalsBlock sPeriod 3Group 2solid at 20 °C
Configuration :[Ne] 3s²
Atomic mass :24.305 u
French :Magnésium
3D Bohr-model representation of the Magnesium atom (symbol Mg, atomic number Z=12). Electron shell configuration: 2, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s²
Short[Ne] 3s²
Valence electrons2
KLMNOPQ shells
K2
L8
M2
Electronegativity
Pauling1.31
Allen1.293
Mulliken (eV)—
Atomic radii
Empirical150 pm
Calculated145 pm
Covalent141 pm
Van der Waals173 pm
Ionic radii (Shannon-Prewitt)
+272 pm
Successive ionisation energies
I₁737.7 kJ/mol
I₂1450.7 kJ/mol
I₃7732.7 kJ/mol
I₄10542.5 kJ/mol
I₅13630 kJ/mol
Electron affinity—
Oxidation states
+1+2
Bold states = most common.