What happens to the reactivity of Group 7 elements as you move down and why?

- Elements get less reactive as we move down Group 7 - Because as you move down, the elements have a greater distance between the outer energy level and the nucleus - As you move down the outer energy levels become more shielded from the + charge of the nucleus by the internal electrons - These factors reduce the attraction between the outer electrons and the nucleus, making it harder to attract an electron into its outer energy level