Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si (b) C, O, N (c) Na, Li, K (d) Be, Mg, Ca
(d) Be, Mg, Ca.
Be, Mg and Ca are elements of group 2, written in order of their increasing metallic character. On moving down in the group, the metallic character increases.