Arrange Ce + 3 , La + 3 , Pm + 3 and Yb + 3 in increasing order of their ionic radii

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Question: Answered & Verified by Expert

Arrange $\mathrm{Ce}^{+3}, \mathrm{La}^{+3}, \mathrm{Pm}^{+3}$ and $\mathrm{Yb}^{+3}$ in increasing order of their ionic radii

Chemistryd and f Block ElementsJEE MainJEE Main 2002

Options:

A
$\mathrm{Yb}^{+3} < \mathrm{Pm}^{+3} < \mathrm{Ce}^{+3} < \mathrm{La}^{+3}$
B
$\mathrm{Ce}^{+3} < \mathrm{Yb}^{+3} < \mathrm{Pm}^{+3} < \mathrm{La}^{+3}$
C
$\mathrm{Yb}^{+3} < \mathrm{Pm}^{+3} < \mathrm{La}^{+3} < \mathrm{Ce}^{+3}$
D
$\mathrm{Pm}^{+3} < \mathrm{La}^{+3} < \mathrm{Ce}^{+3} < \mathrm{Yb}^{+3}$

Solution:

1046 Upvotes Verified Answer

The correct answer is:
$\mathrm{Yb}^{+3} < \mathrm{Pm}^{+3} < \mathrm{Ce}^{+3} < \mathrm{La}^{+3}$

According to their positions in the periods, these values are in the order :

This is due to lanthanide contraction

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