What is the periodic trend in the variation of valency while going from left to right with in a period? example your answer with reference to period 2 and period 3.
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When moving left to right, the valency first increases then decreases.
In 2nd period, valency of element Li, Be, B, C, N, O, F, Ne are 1,2,3,4,3,2,1,0 respectively.
The same applies to the 3rd period
Explanation:
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