Question

Why the reactivity of Halogens decrease down the group?​

Answer 1

With group 7 elements, the outer shell has 7 electrons. This means that an electron must be gained. Electrons are attracted to the nucleus, therefore if there is a short distance between the outer shell and the nucleus, it will react more. As you go down the group, there are more electron shells which causes shielding as electrons repel. The more repulsion between electrons, the further away the outer shell will be from the nucleus. This would make it harder for the element with many shells to gain an electron so reactivity will be lower.

PLEASE MARK ME AS BRAINLIEST

Answer 2

Answer:

Reactivity of halogen is ability to gain the electron

Explanation

In group from top to bottom the electronegativity decreases therefore reactivity decreases