Home Chemistry D and F - Block Elements NEET Previous Year Question The correct order of ionic radii of Y 3+ , L…
Chemistry D and F - Block Elements NEET Previous Year Question Single Correct MCQ
Published on: August 14, 2026

The correct order of ionic radii of Y 3+ , La 3+ , Eu 3+ and Lu 3+ is

A
Y 3+ < Lu 3+ < Eu 3+ < La 3+
B
Lu 3+ < Y 3+ < Eu 3+ < La 3+
C
Lu 3+ < Eu 3+ < La 3+ < Y 3+
D
La 3+ < Eu 3+ < Lu 3+ < Y 3+

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The correct answer is:
A

The correct order of ionic radii of Y 3+ , La 3+ , Eu 3+ and Lu 3+ , is Y 3+ < Lu 3+ < Eu 3+ < La 3+ becuase Eu and Lu are the members of lanthanide series (so they show lanthanide contraction) and La is the representative element of all elements of such series and Y 3+ ion has lower radii as comparison to La 3+ because it lies immerdiately above it in the periodic table.

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