If the radius of the anion in an ionic solid is \( 200 \mathrm{pm} \), what would be the radius ...

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If the radius of the anion in an ionic solid is \( 200 \mathrm{pm} \), what would be the radius of the cation that fits exactly into a cubic hole?
(a) \( 146.4 \mathrm{pm} \)
(b) \( 82.8 \mathrm{pm} \)
(c) \( 45 \mathrm{pm} \)
(d) None of these
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