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68Er167.259
Erbium
LanthanidesBlock fPeriod 6solid at 20 °C
- Configuration :
- [Xe] 4f¹² 6s²
- Atomic mass :
- 167.259 u
3D Bohr-model representation of the Erbium atom (symbol Er, atomic number Z=68). Electron shell configuration: 2, 8, 18, 30, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹² 6s²
Short[Xe] 4f¹² 6s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N30
O8
P2
Electronegativity
Pauling1.24
Allen—
Mulliken (eV)—
Atomic radii
Empirical175 pm
Calculated226 pm
Covalent189 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+389 pm
Successive ionisation energies
I₁589.3 kJ/mol
I₂1150 kJ/mol
I₃2194 kJ/mol
I₄4120 kJ/mol
Electron affinity—
Oxidation states
+1+2+3
Bold states = most common.