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Question

The correct order of ionic radii of Ce,La,Pm and Yb in its +3 oxidation state is:

A
La3+<Pm3+<Ce3+<Yb3+
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B
La3+<Ce3+<Pm3+<Yb3+
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C
Yb3+<Ce3+<Pm3+<La3+
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D
Yb3+<Pm3+<Ce3+<La3+
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Solution

The correct option is D Yb3+<Pm3+<Ce3+<La3+
Due to lanthanoid contraction, the ionic radii decreases in f-block elements from La to Lu.
Hence the correct order of ionic radius is: Yb3+<Pm3+<Ce3+<La3+

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