In \( \mathrm{NaCl} \) crystal, \( \mathrm{Cl}^{-} \)ions have \( f c c \) arrangement. What is ...

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In \( \mathrm{NaCl} \) crystal, \( \mathrm{Cl}^{-} \)ions have \( f c c \) arrangement. What is the number of \( \mathrm{Cl}^{-} \)ions per unit cell?
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