How do the valency and the atomic size of elements very well going from left to right a longer period in the
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Atomic size decreases on going along a period from left to right because the elctron enters into the same shell, therefore, attraction between nucleus and outermost electron increases and thus atomic size decreases. ... The trend of Valency in periods isincreasing from 1 to 8(inert) while in group it is constant.
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