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Question

The correct order of ionic radii for Y3+, Eu3+, La3+, Lu3+

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

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

Y belongs to 5th period & La belongs to 6th period. Ionic radii increases from Y3+ to La3+ down the group. Due to lanthanoid contraction, ionic radii follows the order
Lu3+<Eu3+<La3+


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