1.

The correct order of ionic radii of the ion is

Answer»

`LA^(3+) lt EU^(3+)lt Lu^(3+) lt Yb ^(3+)`
`Yb ^(3+)lt La ^(3+) lt Eu ^(3+) lt Lu ^(3+)`
`Lu_(3+) lt Eu ^(3+) lt Yb ^(3+) lt La ^(3+)`
`Lu ^(3+) lt Yb ^(3+) lt Eu ^(3+) lt La ^(3+)`

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