In `CaF_(2)` " Crystal , ` Ca^(2+)` ions are present in FCC arrangement. Calculate the number of `F^(-)` ions in the unit cell.

Explanation

To solve the problem of calculating the number of \( F^{-} \) ions in the unit cell of \( CaF_{2} \) where \( Ca^{2+} \) ions are arranged in a face-centered cubic (FCC) structure, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**:
- In \( CaF_{2} \), the \( Ca^{2+} \) ions are arranged in an FCC lattice. In an FCC lattice, there are specific positions occupied by the ions.

2. **Calculate the Number of \( Ca^{2+} \) Ions**:
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