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Chromium
Block dPeriod 4Group 6solid at 20 °C
Configuration :[Ar] 3d⁵ 4s¹
Atomic mass :51.9961 u
French :Chrome
3D Bohr-model representation of the Chromium atom (symbol Cr, atomic number Z=24). Electron shell configuration: 2, 8, 13, 1 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
Short[Ar] 3d⁵ 4s¹
Valence electrons6
KLMNOPQ shells
K2
L8
M13
N1
Electronegativity
Pauling1.66
Allen1.65
Mulliken (eV)—
Atomic radii
Empirical140 pm
Calculated166 pm
Covalent139 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+361.5 pm
+644 pm
Successive ionisation energies
I₁652.9 kJ/mol
I₂1590.6 kJ/mol
I₃2987 kJ/mol
I₄4743 kJ/mol
I₅6702 kJ/mol
Electron affinity64.3 kJ/mol
Oxidation states
-4-2-10+1+2+3+4+5+6
Bold states = most common.