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

The correct order of ionic radii of $\mathrm{Y}^{3+}, \mathrm{La}^{3+}$
$\mathrm{Eu}^{3+}$ and $\mathrm{Lu}^{3+}$ is. (Atomic number, $\mathrm{Y}=39$; $\mathrm{La}=57 ; \mathrm{Eu}=63 ; \mathrm{Lu}=71)$
  1. $\mathrm{Y}^{3+} < \mathrm{La}^{3+} < \mathrm{Eu}^{3+} < \mathrm{Lu}^{3+}$
  2. $\mathrm{Y}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+}$
  3. $\mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+} < \mathrm{Y}^{3+}$
  4. $\mathrm{La}^{3+} < \mathrm{Eu}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Y}^{3+}$

Solution

Correct order is $=\mathrm{Y}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+}$ due to lanthanide contraction /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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