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In NaCl crystal the Cl^(-) ions are in f...

In NaCl crystal the `Cl^(-)` ions are in f.c.c. arrangement. Calculate the number of `Cl^(-)` ions in unit cell.

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`Cl^-` ion per unit cell =`8xx1/8` (from corners ) + `6xx1/2` (from face centres)=4
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