The radius of La³⁺ (Z = 57) is 106 pm. Which one of the following given values will be closest to the radius of Lu³⁺ (Z = 71)?

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160 pm

85 pm

106 pm

140 pm

answer is D.

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Detailed Solution

Since ionic radii decreases from La³⁺ to Lu³⁺, due to lanthanoid contraction, so Lu³⁺ have least ionic radii out of the given radii. Hence answer is 85 pm.

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