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3D Bohr-model representation of the Thallium atom (symbol Tl, atomic number Z=81). Electron shell configuration: 2, 8, 18, 32, 18, 3 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p¹
Short[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N32
O18
P3
Electronegativity
Pauling1.62
Allen—
Mulliken (eV)—
Atomic radii
Empirical190 pm
Calculated156 pm
Covalent145 pm
Van der Waals196 pm
Ionic radii (Shannon-Prewitt)
+1150 pm
Successive ionisation energies
I₁589.4 kJ/mol
I₂1971 kJ/mol
I₃2878 kJ/mol
Electron affinity36.4 kJ/mol
Oxidation states
-5-2-1+1+2+3
Bold states = most common.