Atoms A,B,C and D are present at corners, face centres , body-centres and edge-centres respectively, in a cubic unit cell.if two atoms from corners and two from face-centres are removed, then what is the formula of compound ?

Explanation

To solve the problem, we need to determine the effective number of atoms of each type in the cubic unit cell after removing specific atoms. Let's break it down step by step.

### Step 1: Identify the contributions of each atom type in the unit cell.

1. **Atoms at Corners (A)**:
- There are 8 corners in a cubic unit cell.
- Each corner atom contributes \( \frac{1}{8} \) to the unit cell.
- Total contribution from A = \( 8 \times \frac{1}{8} = 1 \).
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