The Solid State - Result Question 32

####32. In the fluorite structure, the coordination number of Ca2+ ion is :

(a) 4

(b) 6

(c) 8

(d) 3

[1993]

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Solution:

  1. (c) In fluorite structure, each Fion is surrounded by four Ca2+ ions whereas, each Ca2+ is surrounded by eight Fions, giving a body centred cubic arrangement. Thus the co-ordination number of Ca2+=8.


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