In an ionic compound `A^+ B^-`, radius of `A^+` 88 pm while that of `B^-` is 200 pm. The coordination number `A^+` will be ______

Explanation

To determine the coordination number of the cation \( A^+ \) in the ionic compound \( A^+ B^- \), we can use the radius ratio rule. Here are the steps to solve the problem:

### Step-by-Step Solution:

1. **Identify the Radii**:
- The radius of the cation \( A^+ \) is given as 88 pm.
- The radius of the anion \( B^- \) is given as 200 pm.

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