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The correct order of ionic radii Y^(3+) ...

The correct order of ionic radii `Y^(3+)` , `La^(3+)` , `Eu^(3+)` and `Lu^(3+)` is `(AT. No : Y = 39, La = 57, Eu = 63, Lu = 71)`

A

`Y^(3+)ltLa^(3+)ltEu^(3+)ltLu^(3+)`

B

`Y^(3+)ltLu^(3+)ltEu^(3+)ltLa^(3+)`

C

`Lu^(3+)ltEu^(3+)ltLa^(3+)ltY^(3+)`

D

`La^(3+)ltEu^(3+)ltLu^(3+)ltY^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) The element Y is a transition metal (4d-series) while the rest are lanthanoids.
`Y^(3+)` has the smallest size. For the rest, the size decreases along a period.
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