The Solid State Ques 26
26. In the fluorite structure, the coordination number of $Ca^{2+}$ ion is :
[1993]
(a) 4
(b) 6
(c) 8
(d) 3
Show Answer
Answer:
Correct Answer: 26.(c)
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 $Ca^{2+}=8$.
BETA
