Agl crystallises in cubic close packed ZnS structure. What fraction of tetrahedral sites is occupied byAg^(+)ions?

Agl crystallises in cubic close packed ZnS structure. What fraction of

1.	Agl crystallises in cubic close packed ZnS structure. What fraction of tetrahedral sites is occupied byAg^(+)ions?
Answer» Solution :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.