Why the third shell(M shell) of iron(Fe) occupies only 14 electrons?
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The electron filling depends upon the energy levels of the orbitals. Lower energy orbitals get filled up first. ... 4s energy is less than 3d, hence the two electrons which you expected to be going to 3d goes to 4s before 3d filling starts. Hence you end up having 14 electrons in 3rd shell and 2 electron in 4s.
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