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

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(1) \( \mathrm{Y}^{3+}\mathrm{La}^{3+}\mathrm{Eu}^{3+}\mathrm{Lu}^{3+} \)
(2) \( \mathrm{Lu}^{3+}\mathrm{Eu}^{3+}\mathrm{La}^{3+}\mathrm{Y}^{3+} \)
(3) \( \mathrm{La}^{3+}\mathrm{Eu}^{3+}\mathrm{Lu}^{3+}\mathrm{Y}^{3+} \)
(4) \( \mathrm{Y}^{3+}\mathrm{Lu}^{3+}\mathrm{Eu}^{3+}\mathrm{La}^{3+} \)
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