How does the valency vary on going down a group ?

How does the valency vary in going down a group?

How does the valency vary in going down a group?

How does the valency of elements vary is going down a group of the periodic table?

How does the valency of elements vary a) in going down a group b) in going from left to right in a period of the periodic table.

How does the atomic size vary as you go down a group ?

How do the Density property vary on moving down the group 13?