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The radius of ${La}^{3 +}$ (at. no. 57) is $1 .06 A^{o}$ What may be the radius of ${Lu}^{3 +} (at . no . 71) ?$

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$1 .06 A^{o}$

$0 .85 A^{o}$

$1 .60 A^{o}$

$1 .40 A^{o}$

answer is B.

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Detailed Solution

Due to lanthanoid contraction the decrease in the ionic radii among the lanthanides is very small.

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