Write the coordination number of each ion in the following crystals :
(i)NaCl (ii)CsCl (iii)ZnS (iv)`Na_2O`

Explanation

To determine the coordination number of each ion in the given crystals, we need to analyze the crystal structure of each compound. The coordination number is defined as the number of nearest neighboring ions surrounding a central ion in a crystal lattice.

Let's solve the question step by step:

### Step 1: NaCl (Sodium Chloride)
- In NaCl, sodium ions (Na⁺) and chloride ions (Cl⁻) are arranged in a face-centered cubic (FCC) structure.
- Each Na⁺ ion is surrounded by 6 Cl⁻ ions, and each Cl⁻ ion is surrounded by 6 Na⁺ ions.
- **Coordination Number:**
...