The radius of La 3+ (Atomic number of La=57 ) is 1 .06 Å . Which one of the following given values will be closest to the radius of Lu 3 + (Atomic number of Lu=71 ) ?

Question

The radius of La 3+ (Atomic number of La=57 ) is 1 .06 Å . Which one of the following given values will be closest to the radius of Lu 3 + (Atomic number of Lu=71 ) ?, 1.60 A ∘, 1.40 A ∘, 1.06 A ∘, 0.85 A ∘

MARKS App · Accepted Answer

Due to lanthanide contraction , the ionic radii of Ln 3 + ( lanthanide ions ) decreases from La 3 + to Lu 3 + . Thus the lowest value ( here 0.85 A ∘ is the ionic radius of Lu 3+ .

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