In any period,the valency of an element with | vedclass

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(C) The valency of an element with respect to oxygen is defined as the number of oxygen atoms that combine with one atom of the element.For elements i

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Increases one by one from $IA$ to $IVA$ and then decreases from $VA$ to $VIIA$ one by one

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(C) The valency of an element with respect to oxygen is defined as the number of oxygen atoms that combine with one atom of the element.For elements in a period,the valency with respect to oxygen increases from $1$ to $4$ as we move from group $IA$ to $IVA$.After group $IVA$,the valency with respect to oxygen decreases from $3$ to $1$ as we move from group $VA$ to $VIIA$ (e.g.,$Na_2O$ (valency $1$),$MgO$ (valency $2$),$Al_2O_3$ (valency $3$),$SiO_2$ (valency $4$),$P_2O_5$ (valency $5$ is oxidation state,but valency w.r.t oxygen is $3$ for $P_2O_3$ or $5$ for $P_2O_5$ depending on the oxide,generally it follows the pattern $1, 2, 3, 4, 3, 2, 1$)).Thus,the valency increases from $IA$ to $IVA$ and then decreases from $VA$ to $VIIA$.

In any period,the valency of an element with respect to oxygen:

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