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Technetium
Block dPeriod 5Group 7solid at 20 °C
Configuration :[Kr] 4d⁵ 5s²
Atomic mass :98 u
French :Technétium
3D Bohr-model representation of the Technetium atom (symbol Tc, atomic number Z=43). Electron shell configuration: 2, 8, 18, 13, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Kr] 4d⁵ 5s²
Short[Kr] 4d⁵ 5s²
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N13
O2
Electronegativity
Pauling1.9
Allen1.51
Mulliken (eV)—
Atomic radii
Empirical135 pm
Calculated183 pm
Covalent147 pm
Van der Waals—
Successive ionisation energies
I₁702 kJ/mol
I₂1470 kJ/mol
I₃2850 kJ/mol
Electron affinity53 kJ/mol
Oxidation states
-3-10+1+2+3+4+5+6+7
Bold states = most common.