Model Paper 2 — Chemistry STD 11 Science — Question

The reactivity of non - metals is measured in terms of its tendency to gain electrons to form an ion. The reactivity of non - metals increases from left to right in a period because of increase in nuclear charge due to succesive addition of electron in same shell whereas reactivity decreases in a group as we go down the group because of increase in atomic size and decrease in nuclear charge. Therefore, the tendency to accept electrons decreases down the group.