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  4. What are the coordination numbers (C.N.) of Ca2+ and F- ion in calcium fluoride (CaF2) crystal structure ?

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Q. What are the coordination numbers $ (C.N.) $ of $ Ca^{2+} $ and $ F^- $ ion in calcium fluoride $ (CaF_2) $ crystal structure ?

J & K CETJ & K CET 2018The Solid State

Solution:

Each $Ca^{2+}$ ion is surrounded by $8F^{-}$ ions and each $F^{-}$ ion by $4\,Ca^{2+}$ ions. Thus, coordination number of $Ca^{2+}$ is $8$ and $F^{-}$ is $4$