Question

Which of the statement(s) regarding 3-D bcc closed packing is/are correct?

• A. Spheres in first layer are touching each other.
• B. Sphere in second layer is placed at hollow space of layer 1
• C. Arrangement of third layer is different to that of first layer
• D. Arrangement of third layer is identical to that of first layer

Answer 1

Answer: (B), (D)

Arrangement of third layer is identical to that of first layer

In 3D bcc closed packing, spheres of first layer are not touching each other.
The spheres in second layer are not touching with each other, placed at the top of the hollow spaces in the first layer​.
The spheres in the third layer​ are placed exactly as in the first layer​.

Thus, option(a), (b) and (c) are correct.
Hence, the correct option is (d).