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Q.

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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a

0.85A0

b

1.06A0

c

1.60A0

d

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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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)