What is the coordination number of Na^{+} and Cl^{-} ions in NaCl lattice?
- A. 6,1
- B. 1,6
- C. 6,6 ✓
- D. 5,5
Correct Answer: C. 6,6
Explanation
In a face-centered cubic (FCC) lattice of NaCl, each Na^{+} ion is surrounded by 6 Cl^{-} ions, and each Cl^{-} ion is surrounded by 6 Na^{+} ions, giving a coordination number of 6:6.
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