how does valency of an element vary across a period?
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Explanation:
The valency of an element first increases and then decreases across a period.
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The valency of an element is dependent on the number of electrons in the outermost shell of the electron. ... Across the a period, the number however increase by 1. Therefore in group 1 is valency of 1, in two valency of 2, in three valency of 3..and so on.
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