Q.

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

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a

4 and 2

b

6 and 6

c

8 and 4

d

4 and 8

answer is C.

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Detailed Solution

In fluorite structure, Ca2+ ions are in the face centred cubic arrangement. Each Ca2+ is connected to 4F- ions below it and to another set of 4F- ions above iti.e. Ca2+ has a coordination number of 8 and each F- ion has a coordination number 4 .
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