A solid \( A B \) has \( \mathrm{CsCl} \) type structure. The edge length of the unit cell is \(...

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A solid \( A B \) has \( \mathrm{CsCl} \) type structure. The edge length of the unit cell is \( 404 \mathrm{pm} \). Calculate the distance of closest approach between \( \mathrm{A}^{+} \)and \( \mathrm{B} \) - ions.
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