(A) The total number of electrons is $2+2+6+2 = 12$. This corresponds to the element Magnesium $(Mg)$. Since it has $2$ electrons in its outermost she

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(A) The total number of electrons is $2+2+6+2 = 12$. This corresponds to the element Magnesium $(Mg)$. Since it has $2$ electrons in its outermost shell $(3s^2)$,it belongs to Group $2$ of the periodic table. Elements in Group $2$ are known as alkaline earth metals. Therefore,the element is a metal.