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AgI crystallises in a cubic close-packed...

AgI crystallises in a cubic close-packed ZnS structure. What fraction of tetrahedral sites is occupied by `Ag^(+)` ions ?

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In the face-centred unit cell of AgI, there are `4 Ag^+` ions and `4 I^-` ions. As there are `4 I^-` ions in the packing. Therefore, there are eight tetrahedral voids. Of these , half are occupied by silver cations.
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