Potassium crystallizes in a body-centred cubic unit cell. What is the unit-cell content (Z) for potassium?

Explanation

To determine the unit-cell content (Z) for potassium, which crystallizes in a body-centered cubic (BCC) structure, we can follow these steps:

### Step 1: Understand the BCC Structure
In a body-centered cubic unit cell, there are atoms located at specific positions:
- Atoms at each of the 8 corners of the cube.
- 1 atom at the center of the cube.

### Step 2: Calculate the Contribution of Corner Atoms
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