Answer to Question #238342 in General Chemistry for Ket

Question

Based on electronegativity, the reactivity of the elements of the halogen group with the increase of the ordinal number goes by?

Answer 1

The electronegativity of the halogens decreases down the group as the radius of each atom increases due to more shells. This means there is less attraction between the positive nucleus and the outer electrons as you go down the group.