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Select the correct order of ions with respect to their ionic radii.

1. \( Y^{3+}<L u^{3+}<E u^{3+}<L a^{3+} \)
2. \( L u^{3+}<Y^{3+}<E u^{3+}<L a^{3+} \)
3. \( L u^{3+}<E u^{3+}<L a^{3+}<Y^{3+} \)
4. \( L a^{3+}<E u^{3+}<L u^{3+}<Y^{3+} \)

Correct answer: \( Y^{3+}<L u^{3+}<E u^{3+}<L a^{3+} \)

Solution

Across the lanthanides, ionic radii decrease due to lanthanide contraction. Y3+ is smaller than the lanthanides listed, and among Lu3+, Eu3+, and La3+, the radius increases as contraction decreases, giving the stated order.

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