Question

The $C{a}^{2+}$ and $F^{-}$ are located in $Ca{F}_2$ crystal respectively at face-centred cubic lattice points and in

• A. tetrahedral voids
• B. half of tetrahedral voids
• C. octahedral voids
• D. half of octahedral voids

Answer 1

Answer: (A)

tetrahedral voids

The $C{a}^{2+}$ and $F^{-}$ are located in $Ca{F}_2$ crystal respectively at face-centred cubic lattice points and in tetrahedral voids. The calcium fluoride structure is also called fluorite structure. It is 8: 4 arrangement, the coordination number of $C{a}^{2+}$ and $F^{-}$ ions is 8 and 4 ions respectively.