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Question

The correct increasing order of ionic radii of the following Ce3+,La3+,Pm3+ and Yb3+ is:

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

The correct option is A Yb3+<Pm3+<Ce3+<La3+
The ionic radii of the lanthanides decrease from 103 pm(La3+) to 86 pm(Lu3+) in the lanthanide series. Across the lanthanide series, electrons are added to the 4f shell.

Therefore, option A is correct.

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