Question

Why does reactivity increase down group 1 but decrease down group 7?

Answer 1

Volatility decreases down the group as the boiling points increase. As you go down group 7, the halogens become less reactive. - Nuclear charge increases, so the nuclear attraction on the outer electrons are stronger. - Electron Shielding increases and outweighs the nuclear attraction.

Answer 2

Volatility decreases down the group as the boiling points increase. As you go down group 7, the halogens become less reactive. - Nuclear charge increases, so the nuclear attraction on the outer electrons are stronger. - Electron Shielding increases and outweighs the nuclear attraction.