Question

For nonmetals, how does chemical reactivity trend in a group?

It increases down a group.

It decreases down a group.

Answer 1

It depends on the group of nonmetals being considered. The group 17 elements (halogens) generally exhibit an increase in chemical reactivity down the group. On the other hand, group 18 elements (noble gases) generally have very low chemical reactivity and do not follow a clear trend down the group.