How does valency of an element vary across a period
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the valency of a element first increases from 1 to 4 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. In a group all constituting elements will have the same valency because they all have the same number of electrons in the outer shells. Across the a period, the number however increase by 1.
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