Which configuration is the same as cubic close packed?

Cubic close packed (CCP) refers specifically to the arrangement of atoms in a three-dimensional space where the atoms are packed together in a way that maximizes density, and it is synonymous with face-centered cubic (FCC) structure. In the face-centered cubic arrangement, atoms are located at each of the corners and at the centers of all the faces of the cube, contributing to a highly efficient packing.

Both the cubic close packed and face-centered cubic structures have a coordination number of 12, indicating that each atom contacts 12 neighbors, enhancing packing efficiency. Additionally, both structures show a similar arrangement of layers; they consist of alternating layers of atoms that effectively fit into the spaces of the layers beneath them, allowing for the close packing characteristic of these structures.

In contrast, hexagonal close packed (HCP) is another efficient packing arrangement but is distinct from cubic arrangements and has a different geometric structure. Primitive unit cells and body-centered cubic (BCC) structures do not exhibit the same coordination number or layer arrangements as CCP/FCC, making those options unrelated to cubic close packing.