The arrangement of \( \mathrm{X}^{-} \)ions around \( \mathrm{A}^{+} \)ion in solid \( \mathrm{A...

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The arrangement of \( \mathrm{X}^{-} \)ions around \( \mathrm{A}^{+} \)ion in solid \( \mathrm{AX} \) is given in the figure (not drawn to scale). If the radius
P of \( \mathrm{X}^{-} \)is \( 250 \mathrm{pm} \), the radius of \( \mathrm{A}^{+} \)is :

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[JEEAdvanced-2013]
(A) \( 104 \mathrm{pm} \)
(B) \( 125 \mathrm{pm} \)
(C) \( 183 \mathrm{pm} \)
(D) \( 57 \mathrm{pm} \)
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