In each of the compounds : NaCl, ZnS and ` CaF_(2)` ,
Write (i) ions occupying the voids (ii) types of voids occupied (iii) fraction of voids occupied.

Explanation

To solve the problem, we will analyze each compound (NaCl, ZnS, and CaF₂) step by step, focusing on the ions occupying the voids, the types of voids occupied, and the fractions of voids occupied.

### Step 1: Analyze NaCl
1. **Ions occupying the voids:** In NaCl, the Na⁺ ions occupy the octahedral voids.
2. **Types of voids occupied:** The type of voids occupied by Na⁺ ions is octahedral voids.
3. **Fraction of voids occupied:** In the face-centered cubic (FCC) structure of NaCl, there are 4 octahedral voids. Since all of these voids are occupied by Na⁺ ions, the fraction of voids occupied is 4/4 = 1.

### Step 2: Analyze ZnS
...