(B) As we move down a group in the periodic table,the atomic size increases due to the addition of new electron shells. Consequently,the valence elect

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It decreases as we move down the group.

(B) As we move down a group in the periodic table,the atomic size increases due to the addition of new electron shells. Consequently,the valence electrons are further away from the nucleus and are held less tightly. Therefore,the ionization energy decreases as we move down Group $1$.