In a body centred cubic arrangement----------- atoms along the body diagonal touch each other.

Explanation

To solve the question regarding how many atoms along the body diagonal of a body-centered cubic (BCC) arrangement touch each other, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of BCC**:
- In a body-centered cubic (BCC) arrangement, there are atoms located at each of the eight corners of the cube and one atom at the center of the cube.

2. **Identify the Body Diagonal**:
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