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\( \mathrm{Ce}^{3+}, \mathrm{La}^{3+}, \mathrm{Pm}^{3+} \) and \( \mathrm{Yb}^{3+} \) have ionic radii in the
P increasing order as

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(1) \( \mathrm{La}^{3+}\mathrm{Ce}^{3+}\mathrm{Pm}^{3+}\mathrm{Yb}^{3+} \)
(2) \( \mathrm{Yb}^{3+}\mathrm{Pm}^{3+}\mathrm{Ce}^{3+}\mathrm{La}^{3+} \)
(3) \( \mathrm{La}^{3+}=\mathrm{Ce}^{3+}\mathrm{Pm}^{3+}\mathrm{Yb}^{3+} \)
(4) \( \mathrm{Yb}^{3+}\mathrm{Pm}^{3+}\mathrm{La}^{3+}\mathrm{Ce}^{3+} \)
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