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In the wurtzite crystal lattice, what are the coordination numbers of Zn2+ and S2- respectively?

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

Correct answer: 4, 4

Solution

In the wurtzite (ZnS) lattice both Zn2+ and S2- are tetrahedrally coordinated, giving 4:4 coordination, not 6:6.

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