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3D Bohr-model representation of the Zirconium atom (symbol Zr, atomic number Z=40). Electron shell configuration: 2, 8, 18, 10, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d² 5s²
Short[Kr] 4d² 5s²
Valence electrons4
KLMNOPQ shells
K2
L8
M18
N10
O2
Electronegativity
Pauling1.33
Allen1.32
Mulliken (eV)—
Atomic radii
Empirical155 pm
Calculated206 pm
Covalent175 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+472 pm
Successive ionisation energies
I₁640.1 kJ/mol
I₂1270 kJ/mol
I₃2218 kJ/mol
I₄3313 kJ/mol
I₅7752 kJ/mol
Electron affinity41.1 kJ/mol
Oxidation states
-20+1+2+3+4
Bold states = most common.