In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca^2+) and fluoride ion (F^-) are
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) 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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Correct option (c) 8 and 4
Explanation :
In fluorite structure, Ca2+ ions are in the face centred cubic arrangement. Each Ca2+ is connected to 4 F- ions below it and to another set of 4 F- ions above it i.e. Ca2+ has a coordination number of 8 and each F ion has a coordination number 4.
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