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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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To maintain stoichiometry, `Ag^(+)` ions occupy half the tetrahedral sites because there are two tetrahedral sites occupied for each `I^(-)` ion.
`:.` 50% tetrahedral sites are occupied.
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