Tungsten crystallizes in body centred cubic unit cell. If the edge of the unit cell is `316.5` pm, what is the radius of tungsten atom ?

Explanation

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

### Step 1: Understand the BCC structure
In a BCC unit cell, there are atoms located at the corners of the cube and one atom at the center. The relationship between the edge length (a) of the unit cell and the radius (r) of the atom can be expressed as:
\[ \sqrt{3}a = 4r \]

### Step 2: Identify the given values
From the problem, we know:
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