In Calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion $(C a^{2 +})$ and fluoride ion $(F^{-})$ are

8 and 4

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4 and 8

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4 and 2

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6 and 6

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Solution

The correct option is A 8 and 4
The fluorite structure, seen in calcium fluoride, has the calcium ions in a face centered cubic array with the fluoride ions in all (8) of the tetrahedral holes. The fluoride ions have a coordination number of 4, and the calcium ions have a coordination number of 8.

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In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion $C a^{2 +}$ and fluoride ion $(F^{-})$ are

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