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Because valence electron are always in the outer most layer (here the N number). You would think that the valence would come from the D orbital but if you look attentively, there will always be a S orbital with a higher N number.

Example: Sc 1s2 2s2 2p6 3s2 3p6 4s2 3d1

The valence electron will always come from the 4s2 subshell, and as you go along the period, the electrons are going to add up only in the 3d orbital.

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