• # question_answer 74) $C{{e}^{3+}},L{{a}^{3+}},P{{m}^{3+}}$ and $Y{{b}^{3+}}$ have ionic radii in the increasing order as                   A)  $L{{a}^{3+}}<C{{e}^{3+}}<P{{m}^{3+}}<Y{{b}^{3+}}$B)  $Y{{b}^{3+}}<P{{m}^{3+}}<C{{e}^{3+}}<L{{a}^{3+}}$C)  $L{{a}^{3+}}=C{{e}^{3+}}<P{{m}^{3+}}<Y{{b}^{3+}}$D)  $Y{{b}^{3+}}<P{{m}^{3+}}<L{{a}^{3+}}<C{{e}^{3+}}$

Ionic radii $\propto \frac{1}{2}$ The values of Z for different elements are as $Yb=70,$ $Pm=61,$$Ce=58,$$La=57$