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Question

In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion Ca2+ and fluoride ion (F) are


A

4 and 2

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B

6 and 6

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C

8 and 4

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D

4 and 8

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Solution

The correct option is C

8 and 4


CaF2AB2 type structure (Fluorite type)
Ca2+ Face central cubic lattice points
F tetrahedral voids
Each Ca2+ surrounded by 8F ions
Each F surrounded by 4Ca2+ ions
C.N. of Ca2+ and F are 8 and 4 respectively


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