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The radius of `La^(+)` (at no 57) is `1.06Å`. What may be the radius of `Lu^(3+)`(at no.71)?

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The radius of `La^(+)` (at no 57) is `1.06Å`. What may be the radius of `Lu^(3+)`(at no.71)?
A. `1.06Å`.
B. `1.40Å`
C. `1.06Å`
D. `0.85Å`
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Correct Answer - D
Due to lanthanide contraction there occurs net decrease in size, Only `0.85Å` is smaller one.
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