Calculate the number of atoms in a cubic based unit cell having one atome on each corner and two atoms on each body diagonal.

Explanation

To solve the problem of calculating the number of atoms in a cubic-based unit cell with one atom at each corner and two atoms on each body diagonal, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Contribution of Corner Atoms:**
- In a cubic unit cell, there are 8 corners.
- Each corner atom is shared by 8 adjacent unit cells.
- Therefore, the contribution of one corner atom to the unit cell is \( \frac{1}{8} \).
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