The Solid State - Result Question 32
####32. In the fluorite structure, the coordination number of $Ca^{2+}$ ion is :
(a) 4
(b) 6
(c) 8
(d) 3
[1993]
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Solution:
- (c) In fluorite structure, each $F^{-}$ion is surrounded by four $Ca^{2+}$ ions whereas, each $Ca^{2+}$ is surrounded by eight $F^{-}$ions, giving a body centred cubic arrangement. Thus the co-ordination number of $Ca^{2+}=8$.
