Question

15 which element is not a representative element/main group element (s and p block)? a tin (sn) b francium (fr) c technetium (tc) d astatine (at)

Explanation:

Representative elements are in the s - and p - blocks of the periodic table. Tin (Sn) is in group 14 (p - block), Francium (Fr) is in group 1 (s - block), and Astatine (At) is in group 17 (p - block). Technetium (Tc) is a transition metal in the d - block and not a representative element.

Answer:

C. Technetium (Tc)