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In the fluorite arrangement, each fluoride ion is in contact with four calcium ions, while each calcium ion is surrounded by eight fluoride ions. What is the coordination number of calcium ions?

1. 4
2. 6
3. 8
4. 10

Correct answer: 8

Solution

In the fluorite structure, each Ca²⁺ ion is surrounded by eight F⁻ ions, making its coordination number 8. This is a characteristic feature of the fluorite structure.

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