A `NaCl` crystal is found to have `CsCl` structure. How it happened?

Explanation

To understand how a NaCl crystal can exhibit a CsCl structure, we need to analyze the structural differences and the effects of external conditions such as pressure.

### Step-by-Step Solution:

1. **Understanding NaCl Structure**:
- In a NaCl crystal, sodium ions (Na⁺) are surrounded by six chloride ions (Cl⁻) in an octahedral arrangement. This means that each Na⁺ ion has a coordination number of 6, and each Cl⁻ ion also has a coordination number of 6.

2. **Understanding CsCl Structure**:
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