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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 ` 4I ^(-)` ions in the packing , therefore, there are eight tetrahderal voids. Of these , half are occupied by sliver cations.
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