The number of atoms for primitive unit cell is ________, for body centred cubic unit cell is _______ and for face centred cubic unit cell is ___________.

Explanation

To solve the question regarding the number of atoms in different types of unit cells, we will analyze each type of unit cell: primitive (simple cubic), body-centered cubic (BCC), and face-centered cubic (FCC).

### Step-by-Step Solution:

1. **Primitive Unit Cell (Simple Cubic)**:
- In a simple cubic unit cell, atoms are located only at the corners of the cube.
- There are 8 corners in a cube.
- Each corner atom is shared by 8 adjacent unit cells, contributing \( \frac{1}{8} \) of an atom to the unit cell.
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