In calcium fluoride,having the fluorite structure,the coordination numbers for calcium ion $(Ca^{2+})$ and fluoride ion $(F^{-})$ are
- A$4$ and $2$
- B$6$ and $6$
- C$8$ and $4$
- D$4$ and $8$
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$(i)$ What is meant by the term 'coordination number'?
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$(ii)$ What is the coordination number of atoms:
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