The number of unpaired electrons is 5 (in 4d subshell), found in the ground state electron configuration of technetium. Hence, the paired electrons are 38.
Technetium is a chemical element with the symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive.
Technetium-99m is used to image the skeleton and heart muscle in particular, but also for brain, thyroid, lungs, liver, spleen, kidney, gall bladder, bone marrow, salivary and lachrymal glands, heart blood pool, infection and numerous specialized medical studies.
For finding the number of unpaired electrons, first we have to find the atomic number of the element then write the configuration in the ground state, then according to the oxidation state subtract the number of electrons from the outer shell.
What is electron configuration of TC?
Atomic number: 43
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²
[Kr] 4d⁵ 5s²
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