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Arrange Ce^(3+),La^(3+), Pm^(3) and Yb^(...

Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -

A

`Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`

B

`Ce^(3+) lt Yb^(3+) lt Pm^(3+) lt La^(3+)`

C

`Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+)`

D

`Pm^(3+) lt La^(3+) lt Ce^(3+) lt Yb^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
A
Lanthanide contraction is observedin these ions, i.e., ionic radius decreases as atomic number increases.
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