Trend of valency and valence electrons in periodic table
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Valency is depend nature of element 's block element show Only +1abd+2oxidarion state and p block element show.-1,-2,+1,+2,+3,+4,-5,+6,+7 it depend upon group element where'as d block element show all type of oxidation state
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In periods : In period as atomic number increases from left to right, the valence increases from 1 to 4 and then decrease from 4 to zero.
In groups : Down the group valence remains same as all the elements possess the same number of valence electrons.
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