The radius of ${L a}^{3 +}$ (Atomic number of $L a = 57$ ) is $1.06 A$ Which one of the following given values will be closest to the radius of ${L u}^{3 +}$ (Atomic number of $L u = 71$ )?

40 A

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1.06 A

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0. 85

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1.60 A

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Solution

The correct option is A $40 A$
$L a$ and $L u$ belong to lanthanoids ( $4 f$ block element of inner transition elements). Lanthanum is $1^{s t}$ element and $L u$ is last one. In lanthanoids, the atomic and ionic radii decreases with increase in atomic no. It is called as lanthanoid contraction given options has only $0.85 A$ with required conditions.

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Q. The radius of

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

The radius of ${L a}^{3 +}$ (Atomic number of $L a = 57$ ) is $1.06 A$ Which one of the following given values will be closest to the radius of ${L u}^{3 +}$ (Atomic number of $L u = 71$ )?