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NEET UG CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Arrange Ce3+,  La3+,  Pm3+\mathrm{C}{\mathrm{e}^{3 + }},\mathrm{\;L}{\mathrm{a}^{3 + }},\mathrm{\;P}{\mathrm{m}^{3 + }} and Yb3+\mathrm{Y}{\mathrm{b}^{3 + }} in increasing order of their ionic radii
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Correct option: A
Yb3+<Pm3+<Ce3+<La3+\mathrm{Y}{\mathrm{b}^{3 + }} < P{\mathrm{m}^{3 + }} < C{\mathrm{e}^{3 + }} < L{\mathrm{a}^{3 + }}
Option A (Yb3+<Pm3+<Ce3+<La3+\mathrm{Y}{\mathrm{b}^{3 + }} < P{\mathrm{m}^{3 + }} < C{\mathrm{e}^{3 + }} < L{\mathrm{a}^{3 + }}) is correct because ionic radii decrease with increasing atomic number across the lanthanide series due to lanthanide contraction.

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