How many voids per point are present in cubic close packed structures of spheres ?

Explanation

To determine how many voids per point are present in cubic close packed (CCP) structures of spheres, we need to analyze the types of voids formed in such structures.

### Step-by-Step Solution:

1. **Understanding the Structure**:
- Cubic close packed (CCP) structures are equivalent to face-centered cubic (FCC) structures. In an FCC unit cell, atoms are located at the corners and the centers of each face.

2. **Identifying Types of Voids**:
...