In `NaCl`, the chloride ions occuphy the space in a fashion of

Options

A. fcc
B. bcc
C. Both
D. None

Answer

To solve the question regarding how chloride ions occupy space in NaCl, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of NaCl**:
- Sodium chloride (NaCl) crystallizes in a face-centered cubic (FCC) lattice structure.

2. **Understand the FCC Lattice**:
- In an FCC lattice, there are atoms located at each of the corners and at the centers of each face of the cube. This arrangement allows for a close packing of ions.

3. **Determine the Position of Chloride Ions**:
- In the case of NaCl, the chloride ions (Cl⁻) occupy the FCC lattice sites. This means that the Cl⁻ ions are positioned at the face centers and the corners of the cubic unit cell.

4. **Identify the Position of Sodium Ions**:
- The sodium ions (Na⁺) occupy the octahedral voids within the FCC lattice. This is important to note, as it explains the arrangement of the ions in the crystal structure.

5. **Conclude the Arrangement**:
- Therefore, in NaCl, the chloride ions occupy the face-centered cubic lattice sites, while the sodium ions occupy the octahedral voids.

### Final Answer:
The chloride ions in NaCl occupy the FCC lattice sites.