JEE Advanced 2022 Chemistry question
Atom X occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closest to
Answer: (B)
Solution
Atoms per cell: 4 (fcc sites) + 4 (half of the 8 tetrahedral voids) = 8, all of the same radius . An atom in a tetrahedral void touches the corner atom along the body diagonal: $a = 2r
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