Question

where are the most reactive nonmetal elements found on the periodic table?
at the top of group 17
at the bottom of group 17
at the top of group 18
at the bottom of group 18

Explanation:

Group 17 elements are halogens (nonmetals). Reactivity of nonmetals in a group increases up the group (due to smaller atomic size, stronger attraction for electrons). Group 18 are noble gases (inert). So most reactive nonmetals in group 17 are at the top.

Answer:

A. at the top of group 17