(i) How does the tendency to gain electrons change as we go down the group ? Give reason.
(ii) Given below is a part of the periodic table. How does the valency vary, as we move vertically downward from Li to Fr. Give reason.

Explanation

(i) Tendency to gain electrons decreases on moving down the group because with increase in size, effective .+ve. nuclear charge decreases.
(ii) Valency remains constant as we move downwards. Elements of the same group have the same number of valence electrons.