The total number of Na and Cl ions per unit cell of the NaCl crystal is:
- 2
- 4
- 8
- 16
The Correct Option is C
Solution and Explanation
In the NaCl crystal structure:
- Each unit cell contains 4 Na+ ions and 4 Cl− ions.
- These ions are arranged in a face-centered cubic (FCC) structure.
- Each corner ion is shared by 8 adjacent cells, and each face-centered ion is shared by 2 adjacent cells.
Calculation:
The total number of Na+ and Cl− ions per unit cell is:
\[ 4 \, \text{Na}^+ + 4 \, \text{Cl}^- = 8 \, \text{ions} \]
Conclusion:
Therefore, the total number of Na+ and Cl− ions per unit cell of the NaCl crystal is:
\[ \boxed{8 \, \text{ions}} \]
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