A solid \( \mathrm{A}^{+} \)and \( \mathrm{B}^{-} \)has \( \mathrm{...

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A solid \( \mathrm{A}^{+} \)and \( \mathrm{B}^{-} \)has \( \mathrm{NaCl} \) type closed packed structure. If the anion has a radius of 250 pm, what should be the ideal radius of the cation ? Can a cation \( \mathrm{C}^{+} \)having a radius of \( 180 \mathrm{pm} \) be slipped into the tetrahedral site of the crystal of \( \mathrm{A}^{+} \mathrm{B}^{-} \)? Give reasons for your answer.
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