Which among the following lanthanoids has the | vedclass

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(C) In the lanthanoid series,the atomic size decreases from left to right due to lanthanoid contraction.As the atomic number increases,the shielding e

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$Sm$

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(C) In the lanthanoid series,the atomic size decreases from left to right due to lanthanoid contraction.As the atomic number increases,the shielding effect of $4f$ electrons is poor,leading to an increase in effective nuclear charge.Among the given elements ($Ce$,$Pr$,$Pm$,$Sm$),the atomic numbers are $Ce(58)$,$Pr(59)$,$Pm(61)$,and $Sm(62)$.Since atomic size decreases as atomic number increases,$Sm$ has the smallest atomic size among the options provided.The order is $Ce > Pr > Pm > Sm$.

Which among the following lanthanoids has the smallest atomic size?

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