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

Explanation

To calculate the number of atoms in a cubic unit cell with one atom on each corner and two atoms on each body diagonal, we can follow these steps:

### Step 1: Count the Atoms at the Corners
A cubic unit cell has 8 corners. Each corner atom is shared among 8 adjacent unit cells. Therefore, the contribution of each corner atom to the unit cell is:

\[ \text{Contribution from corners} = 8 \times \frac{1}{8} = 1 \text{ atom} \]
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