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A half filled sub-shell is more stable than other partially filled shells. As an example use Chromium. It should by logic have the following:

Sc = [Ar]4s23d1

Ti = [Ar]4s23d2

V = [Ar]4s23d3

Cr should in theory be Cr = [Ar]4s23d4

but it is not. Half filled shells are more stable so the configuration is

Cr = [Ar]4s13d5 two half filled sub levels and then Manganese is

Mn = [Ar]4s23d5 one full and one half filled level.

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