Which of the following doesnt crystallize in the rock-salt structure? (a) \( \mathrm{NaCl} \) (b...

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Which of the following doesnt crystallize in the rock-salt structure?
(a) \( \mathrm{NaCl} \)
(b) \( \mathrm{KCl} \)
(c) \( \mathrm{MgO} \)
(d) \( \mathrm{CsCl} \)
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