How does the number of valence electrons vary on moving from left to right :
(i) in the first period of the periodic table ?
(ii) in the second period of the periodic table
(i) In the first period of the periodic table when we move left to right the number of valence electron increases from 1 to 2.
(ii) In the second period of the periodic table when we move left to right the number of valence electron increases from 1 to 8.