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Question: Answered & Verified by Expert
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion Ca2+ and fluoride ion F- are
ChemistrySolid StateNEETNEET 2016 (Phase 2)
Options:
  • A 4 and 2
  • B 6 and 6
  • C 8 and 4
  • D 4 and 8
Solution:
2701 Upvotes Verified Answer
The correct answer is: 8 and 4
In CaF2, Ca2+ has FCC arrangement and F-  ions are present in all tetrahedral voids.

∴ Co-ordination numbers for Ca2+ and F- ions are 8 and 4.

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