Which of the following pairs has the same size?....

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Which of the following pairs has the same size?
\( \mathrm{P} \)
(1) \( \mathrm{Fe}^{2+}, \mathrm{Ni}^{2+} \)
(2) \( \mathrm{Zr}^{4+}, \mathrm{Ti}^{4+} \)
(3) \( \mathrm{Zr}^{4+}, \mathrm{H} f^{4+} \)
(4) \( \mathrm{Zn}^{4+}, \mathrm{H} f^{4+} \)


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