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Question

In calcium fluoride structure, the coordination numbers of calcium and fluoride ions are:

A
8 and 4
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B
6 and 8
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C
4 and 4
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D
4 and 8
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Solution

The correct option is C 8 and 4
The Ca2+ and F are located in CaF2 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 Ca2+ and F ions is 8 and 4 ions respectively.

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