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)`

`La^(3+) lt Eu^(3+) lt Lu^(3+) lt Y^(3+)`

`Y^(3-) lt La^(3+) lt Eu^(3+) lt Lu^(3+)`

`Lu^(3+) lt Y^(3+) lt Eu^(3+) lt La^(3+)`

`Lu^(3+) lt Eu^(3+) lt La^(3+) lt Y^(3+)`

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The correct Answer is:

Lanthanide contration results in small size of `Lu^(3+)`. So
`Lu^(3+) lt Y^(3+) lt Cu^(3+), lt La^(3+)`

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