how does the valancy of an element vary across the period?
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Answer:
Explanation:
Across the a period, the number increase by 1.
Therefore in group 1 is of valency 1, in two valency of 2, in three valency of 3..and so on.
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valency is changes across the period is proposed first the valency increases 1 to 4 then decreases to 0
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