Element 43

Technetium (Tc)

43

Tc

technetium

Metal · d block · group 7, period 5

Electron configuration: $[\mathrm{Kr}]\,5s^{2}\,4d^{5}$
Unpaired electrons: 5 (paramagnetic)
Molar mass: 98 g/mol
Electronegativity: 1.9
Atomic radius: 136 pm
First ionization energy: 702 kJ/mol
Next ionization energies: 1,472, 2,850
Electron affinity: 53 kJ/mol released

Practice

Practice technetium

No course questions are about technetium specifically, but these lessons cover what you need.

Where it comes up in the course