Radius of cation and anion ( `A^(2+)`and `B^(2-)`) is 100 and 241.42 pm respectively. What is the edge length of the cubic unit cell formed when `A^(2+)` and `B^(2-)` are packed together?

Explanation

To find the edge length of the cubic unit cell formed by the cation \( A^{2+} \) and anion \( B^{2-} \), we can follow these steps:

### Step 1: Identify the given values
- Radius of cation \( (A^{2+}) = r^+ = 100 \, \text{pm} \)
- Radius of anion \( (B^{2-}) = r^- = 241.42 \, \text{pm} \)

### Step 2: Calculate the ratio of the radii
Calculate the ratio of the radius of the cation to the radius of the anion:
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