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The correct order of ionic radii of \mathrm{Y^3^+},\mathrm{La^3^+,Eu^3^+} and \mathrm{Lu^3^+} is

Option: 1

\mathrm{Y^{3+}<L a^{3+}<E u^{3+}<L u^{3+}}


Option: 2

\mathrm{Y^3^+<Lu^3^+<Eu^3^+<La^3^+}


Option: 3

\mathrm{Lu^3^+<Eu^3^+<La^3^+<Y^3^+}


Option: 4

\mathrm{La^3^+<Eu^3^+<Lu^3^+<Y^3^+}


Answers (1)

best_answer

As we have learnt, 

The size of tripositive Lanthanoid ions decreases smoothly on moving across the period due to Lanthanoid Contraction.

Ionic radii decrease from \mathrm{La^3^+} to \mathrm{Lu^3^+}due to lanthanoid contraction and Yttrium(Y) is a period 5 element and will be smaller than the lanthanoids.

Thus, order of ionic radii is \mathrm{La^3^+>Eu^3^+>Lu^3^+>Y^3^+}

Therefore, option (2) is correct.

Posted by

Deependra Verma

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