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In the solid CsCl crystal structure, what is the coordination number of each Cs+ ion?

1. 4
2. 6
3. 8
4. 12

Correct answer: 8

Solution

In CsCl structure, each Cs+ ion is surrounded by 8 Cl- ions at the corners of a cube, giving a coordination number of 8. Similarly each Cl- is surrounded by 8 Cs+ ions.

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