Assuming that atoms are touching each other, calculate the packing efficiency in case of a crystal of simple cubic metal.

Explanation

To calculate the packing efficiency of a simple cubic metal crystal, we can follow these steps:

### Step 1: Understand the Structure of Simple Cubic Unit Cell
In a simple cubic unit cell, there are atoms located at each of the eight corners of the cube.

### Step 2: Calculate the Number of Atoms per Unit Cell
Each corner atom contributes \( \frac{1}{8} \) of its volume to the unit cell. Since there are 8 corners, the total number of atoms (Z) per unit cell is:
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