What happens to the size of the metal ions as you go down group I ? Why is this so?

Answer 1

The atoms increase in size as you move down the group, because each atom has an additional energy level or shell that contains the valence electron.

When atom of group one metals form ions, they lose the valence electron, which causes them to decrease in size.

The smallest ion will be at the top of the column, since it starts out as the smallest atom, and the largest ion will be at the bottom.