In a body centred cubic crystal of an element, the ratio of edge of the unit cell to the radius of the atom is ________.

Explanation

To find the ratio of the edge of the unit cell to the radius of the atom in a body-centered cubic (BCC) crystal structure, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the BCC Structure**:
- In a BCC structure, there is one atom at the center of the cube and one atom at each of the eight corners of the cube.

2. **Identify the Body Diagonal**:
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