Every atom or ion that forms an fcc unit cell is surrounded by :

six octahedral voids and eight tetrahedral voids

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eight octahedral voids and six tetrahedral voids

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sis octahedral voids and six tetrahedral voids

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eight octahedral voids and four tetrahedral voids

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Solution

The correct option is A six octahedral voids and eight tetrahedral voids
From the figure it can be seen that, every atom or ion that forms an fcc unit cell is surrounded by six octahedral voids and eight tetrahedral voids.

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Similar questions

A B_{2} O_{4}

O^{2 -}

A^{2 +}

B^{3 +}

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

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