how does the valency of element change on moving from left to right in the third period of the periodic table.
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Valency increases from left to right, then it decreases as it nears the end of the period. It goes like 1,2,3,4,3,2,1,0.
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The valency increases from 1 to 4 then decreases from 4 to 0 on moving from left to right in the third period of the periodic table .
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