Which of the following groupings contains only representative elements?
A.) Hg, Cr, Ag
B.) Al, Mg, Li
C.) Ni, Fe, Zn
D.) Cu, Co, Cd
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Representative elements are on the left and right side of the transition metals. So the Group A elements are considered the representative elements. These are groups that are headed up by H, Be, B, C, N, O, F, and He. Of the choices given the one that has only representative elements is B.