Thallium
Block pPeriod 6Group 13solid at 20 °C
Configuration :[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
Atomic mass :204.38 u
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Modèle de Bohr · pédagogique
Electron configuration
Full[Xe] 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.