How many sodium ions and chloride ions are present in a unit cell of sodium chloride ?

Explanation

To determine how many sodium ions (Na⁺) and chloride ions (Cl⁻) are present in a unit cell of sodium chloride (NaCl), we can analyze the structure of the NaCl crystal.

### Step-by-Step Solution:

1. **Understanding the Structure of NaCl**:
Sodium chloride crystallizes in a face-centered cubic (FCC) lattice structure. In this arrangement, sodium ions occupy the octahedral voids, while chloride ions occupy the lattice points.

2. **Counting Sodium Ions**:
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