Consider atoms of the following elements. Assume that the atoms are in the ground state.
(A) S(B) Ca(C) Ga(D) Sb(E) Br2. The atom that contains only one electron in the highest occupied energy sublevel
Gallium is in group thirteen with outermost electron configuration ns2 np1. The highest occupied sub-level is np1 having only one electron which is the situation required in the question.
