Which actinoid from the following in its +3 s | vedclass

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(A) In the actinoid series,as the atomic number increases,the ionic radius decreases due to the actinoid contraction,which is analogous to lanthanoid

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$U$

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(A) In the actinoid series,as the atomic number increases,the ionic radius decreases due to the actinoid contraction,which is analogous to lanthanoid contraction. This occurs because the $5f$ electrons provide poor shielding for the increasing nuclear charge. Therefore,the actinoid with the lowest atomic number will have the largest ionic radius in its $+3$ state. Comparing the atomic numbers: $U$ $(Z=92)$,$Bk$ $(Z=97)$,$Es$ $(Z=99)$,and $Md$ $(Z=101)$. Since $U$ has the lowest atomic number among the given options,it has the largest size in its $+3$ state.

Which actinoid from the following in its $+3$ state has the largest size?

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