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The radius of the La³⁺ (atomic number of La = 57) is 1.06A⁰. Which one of the following given values will be closest to the radius of Lu³⁺ (atomic number of Lu = 71)

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0.85A⁰

1.06A⁰

1.60A⁰

1.40A⁰

answer is A.

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Detailed Solution

: Radius of La³⁺ is 1.06 A⁰.

Shielding effect in lanthanides :

In lanthanoids atomic/ionic size reduces with increase in atomic number. Thus, the ionic radius of Lu³⁺ will be smaller than the ionic radius of La³⁺. It will be less than 1.06 A⁰.

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