Group 1 vs group 7

Question 1

Group 1

Answer 1

Reactivity increases down the group, this is because the outer electron is further away from the nucleus meaning the electrostatic attraction is weaker, meaning the outer electron is easier to lose.

Question 2

Group 7

Answer 2

Reactivity decreases down the group, this is because the outer shell is further away from the nucleus meaning that the electrostatic attraction is weaker, this means that is is harder to gain an electron.