The ionic radii for `Na^(+)` and `Br^(-)` ions are `1.012Å` and `1.973Å` respectively. What is the coordination number of `Na^(+)` predicted on the basis of the radii ratio. `(r_(+))/(r_(-))`?

Options

A. 6
B. 8
C. 4
D. 2

Explanation

To determine the coordination number of the `Na^(+)` ion based on the ionic radii of `Na^(+)` and `Br^(-)`, we will follow these steps:

### Step 1: Identify the ionic radii
The ionic radii given are:
- Radius of `Na^(+)` = `1.012 Å`
- Radius of `Br^(-)` = `1.973 Å`

### Step 2: Calculate the radius ratio
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