1.

The correct order ionic radii of Y^(3) ,La^(3+), En^(3+) and Lu^(3+) is

Answer»

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

SOLUTION :Ionic radii decrease from `La^(3+)` to `Lu^(3+)` due to lanthanoid contraction.
`Y(Z=39)` is first member of 4d-series so that `Y^(3+)` is smallest in SIZE.
Thus, order of ionic radii is
`La^(3+) GT Eu^(3_) gt Lu^(3+) gt Y^(3+)`


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