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Relation Between r and a

A unit cell o...

Question

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is:

A

2

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B

4

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C

6

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D

8

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Solution

The correct option is D 8
In fluorite structure of $C a F_{2}$ , $C a^{2 +}$ ions are surrounded by eight neighboring $F^{-}$ ions, while the $F^{-}$ ions are surrounded by a tetrahedron of four $C a^{2 +}$ ions.

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