CsBr crystal has bcc structure. It has an edge length of \( 4.3 \AA \). The shortest interionic ...

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CsBr crystal has bcc structure. It has an edge length of \( 4.3 \AA \). The shortest interionic distance between \( \mathrm{Cs}^{+} \)and \( \mathrm{Br}^{-} \)ions is
(1) \( 1.86 \AA \)
(2) \( 3.72 \AA \)
(3) \( 4.3 \AA \)
(4) \( 7.44 \AA \)
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