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63Eu151.964
Europium
LanthanidesBlock fPeriod 6solid at 20 °C
Configuration :[Xe] 4f⁷ 6s²
Atomic mass :151.964 u
3D Bohr-model representation of the Europium atom (symbol Eu, atomic number Z=63). Electron shell configuration: 2, 8, 18, 25, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Xe] 4f⁷ 6s²
Short[Xe] 4f⁷ 6s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N25
O8
P2
Electronegativity
Pauling1.2
Allen—
Mulliken (eV)—
Atomic radii
Empirical185 pm
Calculated231 pm
Covalent198 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+2117 pm
+394.7 pm
Successive ionisation energies
I₁547.1 kJ/mol
I₂1085 kJ/mol
I₃2404 kJ/mol
I₄4120 kJ/mol
Electron affinity—
Oxidation states
+2+3
Bold states = most common.