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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)

A
Lu3+<Eu3+<La3+<Y3+
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B
La3+<Eu3+<Lu3+<Y3+
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C
Y3+<La3+<Eu3+<Lu3+
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D
Y3+<Lu3+<Eu3+<La3+
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Solution

The correct option is B Y3+<Lu3+<Eu3+<La3+
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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