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65Tb158.925
Terbium
LanthanidesBlock fPeriod 6solid at 20 °C
Configuration :[Xe] 4f⁹ 6s²
Atomic mass :158.925354 u
3D Bohr-model representation of the Terbium atom (symbol Tb, atomic number Z=65). Electron shell configuration: 2, 8, 18, 27, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Xe] 4f⁹ 6s²
Short[Xe] 4f⁹ 6s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N27
O8
P2
Electronegativity
Pauling1.2
Allen—
Mulliken (eV)—
Atomic radii
Empirical175 pm
Calculated225 pm
Covalent194 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+392.3 pm
Successive ionisation energies
I₁565.8 kJ/mol
I₂1110 kJ/mol
I₃2114 kJ/mol
I₄3839 kJ/mol
Electron affinity—
Oxidation states
+1+2+3+4
Bold states = most common.