(D) In the lanthanoid series,as the atomic number increases from $La$ $(Z=57)$ to $Lu$ $(Z=71)$,the ionic radii of the $M^{3+}$ ions decrease due to l

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$Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+}$

(D) In the lanthanoid series,as the atomic number increases from $La$ $(Z=57)$ to $Lu$ $(Z=71)$,the ionic radii of the $M^{3+}$ ions decrease due to lanthanoid contraction.Since the atomic numbers are $La (57) Ce^{3+} > Pm^{3+} > Yb^{3+}$.Therefore,the correct increasing order is $Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+}$.