Question

The close packing arrangement of ABCABC in 3-D refers to which of the following?

• A. Primitive Cubic Close packing
• B. Body-centre Cubic Close packing
• C. Face-centre Cubic Close packing
• D. Hexagonal Close Packing

Answer 1

The correct option is C

Face-centre Cubic Close packing

This seems easier but it’s possible that some of you could have one doubt. Let's see.

When we use our hexagonal close packed arrangement in 2-D and make a ABCABC type arrangement, we end up with Face-centered Cubic close packing as we had discussed.

But if we use our square close packed arrangement in 2-D and try to make ABCABC type arrangement, we would just end up with another ABABA type arrangement. So, it doesn’t give us any new arrangement.