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Atomic and Ionic Sizes of Lanthanides

Arrange Ce3...

Question

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

A

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

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B

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

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C

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

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D

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

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Solution

The correct option is A $Y b^{3 +} < P m^{3 +} < C e^{3 +} < L a^{3 +}$
As we move from left to right in a period, radii decrease due to an increase in nuclear charge and lanthanide contraction.
So the order is $Y b^{3 +} < P m^{3 +} < C e^{3 +} < L a^{3 +} .$

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