A) 6, 6
B) 8, 4
C) 4,4
D) 4,8
Correct Answer: B
Solution :
In calcium fluoride structure, the \[C{{a}^{2+}}\] ions are arranged in ccp (cubic closed packed) arrangement, ie, \[C{{a}^{2+}}\] ions are present at all comers and the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. This is 8 : 4 arrangement ie, each \[C{{a}^{2+}}\] ion is surrounded by \[8{{F}^{-}}\] ions and each \[{{F}^{-}}\] ion by four \[C{{a}^{2+}}\] ions.
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