• # question_answer Which one of the following is the correct increasing order of the magnitude of ionic radii of $C{{e}^{3+}},L{{a}^{3+}},$$P{{m}^{3+}}$and $Y{{b}^{3+}}?$ A) $Y{{b}^{3+}}<P{{m}^{3+}}<L{{a}^{3+}}<C{{e}^{3+}}$B) $Y{{b}^{3+}}<P{{m}^{3+}}<C{{e}^{3+}}<L{{a}^{3+}}$C) $P{{m}^{3+}}<L{{a}^{3+}}<C{{e}^{3+}}<Y{{b}^{3+}}$D) $C{{e}^{3+}}<Y{{b}^{3+}}<P{{m}^{3+}}<L{{a}^{3+}}$

$\underset{\text{103}\,\text{pm}}{\mathop{\text{L}{{\text{a}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{102}\,\text{pm}}{\mathop{\text{C}{{\text{e}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{97}\,\text{pm}}{\mathop{\text{P}{{\text{m}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{86}\text{.8}\,\text{pm}}{\mathop{\text{Y}{{\text{b}}^{\text{3+}}}}}\,$ Hence, the correct option is [b].