How does number of (i) valence electrons (ii) valency vary on moving from left to right : (i) in the second period of a periodic table (b) in the third period of a periodic table
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1) valence electrons increases from 0 to 8.
2) valency first increases from 0 to 4 then decrease from 4 to 0.
2) valency first increases from 0 to 4 then decrease from 4 to 0.
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