how does valency of an element vary across a period?
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Valency remains same across a group(top to bottom) and first increases and then decreases across a period (left to right)
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exp: The valency of an element depends the availability of an electrons (or electrons) in its valence shell i.e on its valence electrons. Across the period, first it increases from 0 to 4 and then starts decreasing from 4 to
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