The radius of the `Na^(+)` is 95 pm and that of CI ion is 181 pm Predict the coordination number of `Na^(+)` ?

Explanation

To determine the coordination number of the Na⁺ ion based on its radius and the radius of the Cl⁻ ion, we can follow these steps:

### Step 1: Identify the radii of the ions
- The radius of Na⁺ (cation) is given as 95 pm.
- The radius of Cl⁻ (anion) is given as 181 pm.

### Step 2: Calculate the radius ratio (rc/ra)
- The radius ratio is calculated using the formula:
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