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

Question

Philoid · Accepted Answer

(i) In a group, the elements have same number of electron in its last shell so the valency of electrons in the group is same.

(ii) In a period as we move left to right, first the valency of the electron increases from 1 to 4 and then decreases to zero.