Which of the following fcc structure contain cations in alternate tetrahedral voids?

Options

A. NaCl
B. ZnS
C. `Na_(2)O`
D. `CaF_(2)`

Explanation

To determine which of the following FCC structures contains cations in alternate tetrahedral voids, we can analyze the given options step by step.

### Step 1: Understand the FCC Structure
In a face-centered cubic (FCC) structure, the atoms are located at the corners and the centers of each face of the cube. This arrangement creates different types of voids within the structure, including octahedral and tetrahedral voids.

**Hint:** Remember that in FCC, there are 8 tetrahedral voids per unit cell, and they are located at specific positions within the cell.

### Step 2: Analyze NaCl (Rock Salt Structure)
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