Question

(a) How does the electropositive character of elements change on going down in a group of the periodic table?

(b) State how the valency of elements varies (i) in a group, and (ii) in a period, of the periodic table.

Answer 1

(a) The electropositive character of the elements increases on going down in a group of the periodic table.

(b) (i) In a group, all the elements will have the same valency because all the electrons have the same number of electrons in their outermost shell.

(ii) In a period, different elements have different valencies. On moving from left to right in a period, the valency of the elements increases from 1 to 4 and then decreases to 0.