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3D Bohr-model representation of the Yttrium atom (symbol Y, atomic number Z=39). Electron shell configuration: 2, 8, 18, 9, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹ 5s²
Short[Kr] 4d¹ 5s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N9
O2
Electronegativity
Pauling1.22
Allen1.12
Mulliken (eV)—
Atomic radii
Empirical180 pm
Calculated212 pm
Covalent190 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+390 pm
Successive ionisation energies
I₁600 kJ/mol
I₂1180 kJ/mol
I₃1980 kJ/mol
I₄5847 kJ/mol
I₅7430 kJ/mol
Electron affinity29.6 kJ/mol
Oxidation states
+1+2+3
Bold states = most common.