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In sodium oxide, Na2O, how many oxygen ions are directly surrounded by each sodium ion in the crystal lattice?

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

Correct answer: 4

Solution

In the antifluorite Na2O structure each Na+ is tetrahedrally surrounded by 4 oxide ions (and each O2- by 8 Na+), so the answer is 4, not 2.

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