All of the following share the same crystal structure except

Options

A. LiCl
B. NaCl
C. RbCl
D. CsCl

Answer

To solve the question, "All of the following share the same crystal structure except," we need to analyze the crystal structures of the given compounds: LiCl, NaCl, RbCl, and CsCl.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are LiCl, NaCl, RbCl, and CsCl.

2. **Determine the Crystal Structures**:
- **LiCl**: Lithium chloride has a rock salt structure (also known as face-centered cubic or FCC). In this structure, Cl⁻ ions form an FCC lattice, and Li⁺ ions occupy all the octahedral voids.
- **NaCl**: Sodium chloride also has a rock salt structure (FCC). Similar to LiCl, Cl⁻ ions form an FCC lattice, and Na⁺ ions occupy the octahedral voids.
- **RbCl**: Rubidium chloride shares the same rock salt structure (FCC) as LiCl and NaCl. The Cl⁻ ions form an FCC lattice, and Rb⁺ ions occupy the octahedral voids.
- **CsCl**: Cesium chloride has a different structure known as simple cubic. In this structure, Cl⁻ ions occupy the corners of the cube, and Cs⁺ ions are located at the body center of the cube.

3. **Compare the Structures**:
- LiCl, NaCl, and RbCl all share the same rock salt (FCC) structure.
- CsCl has a simple cubic structure, which is different from the others.

4. **Conclusion**: Since CsCl has a different crystal structure compared to LiCl, NaCl, and RbCl, the answer to the question is that all of the following share the same crystal structure except CsCl.

### Final Answer:
The correct answer is CsCl.

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