The correct order of ionic radii of Y3+, La3+,Eu3+ and Lu3+ is: (Atomic number of Y = 39, La = 57, Eu = 63, Lu = 71)

Engineering

Chemistry

d Block Elements and Properties

Compounds of d Block Elements

Question

The correct order of ionic radii of Y³⁺, La³⁺,Eu³⁺ and Lu³⁺ is:
(Atomic number of Y = 39, La = 57, Eu = 63, Lu = 71)

Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺

La³⁺ < Eu³⁺ < Lu³⁺ < Y³⁺

Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺

Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺

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Due to lanthanide contraction size of lanthanides ions decreases from La³⁺ to Lu³⁺

so order is Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺

Hence, the correct option is D.

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