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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)ltLa^(+3)`

B

`Ce^(+3)ltYb^(+3)ltPm^(+3)ltLa^(+3)`

C

`Yb^(+3)ltPm^(+3)ltLa^(+3)ltCe^(+3)`

D

`Pm^(+3)ltLa^(+3)ltCe^(+3)lt Yb^(+3)`

Text Solution

Verified by Experts

The correct Answer is:
A
Due to Lanthanoid contraction order will be
`Yb^(+3)ltPm^(3+)ltCe^(+3)ltLa^(3+)`
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