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A mineral having the formula AB(2) crys...

A mineral having the formula `AB_(2)` crystallizes in c.c.p. lattice, with A atoms occupying the lattice points. The coordination number of A is 8 and that of B is 4. What percentage of the tetrahedral sites is occupied by B atoms?

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C.N. of A atom = 8, C.N. of B atom = 4
tetrahedral sites occupied by atoms B = 100% (all tetrahedral voids are occupied)
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