The number of atoms in BCC arrangement is:

Options

A. 1
B. 2
C. 8
D. 4

Answer

To determine the number of atoms in a Body-Centered Cubic (BCC) arrangement, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the BCC Structure**:
- In a BCC lattice, there are atoms located at the eight corners of a cube and one atom at the center of the cube.

2. **Calculate Contribution from Corner Atoms**:
- Each corner atom contributes \( \frac{1}{8} \) of an atom to the unit cell because it is shared among eight adjacent cubes.
- Since there are 8 corners in a cube, the total contribution from corner atoms is:
\[ \text{Contribution from corners} = 8 \times \frac{1}{8} = 1 \text{ atom} \]

3. **Calculate Contribution from the Body-Centered Atom**:
- The atom at the body center contributes fully to the unit cell, which is 1 atom.

4. **Total Number of Atoms in BCC**:
- To find the total number of atoms in the BCC unit cell, we add the contributions from the corner atoms and the body-centered atom:
\[ \text{Total number of atoms} = \text{Contribution from corners} + \text{Contribution from body center} = 1 + 1 = 2 \text{ atoms} \]

### Final Answer:
- The total number of atoms in a BCC arrangement is **2**.