Arrange $C e^{+ 3}, L a^{+ 3}, P m^{+ 3}$ and $Y b^{+ 3}$ in increasing order of their ionic radii

Y b^{+ 3} < P m^{+ 3} < C e^{+ 3} < L a^{+ 3}

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C e^{+ 3} < Y b^{+ 3} < P m^{+ 3} < L a^{+ 3}

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Y b^{+ 3} < P m^{+ 3} < L a^{+ 3} < C e^{+ 3}

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P m^{+ 3} < L a^{+ 3} < C e^{+ 3} < Y b^{+ 3}

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Solution

The correct option is A $Y b^{+ 3} < P m^{+ 3} < C e^{+ 3} < L a^{+ 3}$
Due to Lanthanoid contraction order will be $Y b^{+ 3} < P m^{+ 3} < C e^{+ 3} < L a^{+ 3}$

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