Which of the following statements concerning different three-dimensional close-packed structures are — Solid State Chemistry Question

💡 Solution & Explanation

In 3D close packing, HCP is built via ABABAB... layers while CCP is ABCABC... layers. In both systems, a single sphere is surrounded by 12 nearest neighbors (C.N. = 12), and both exhibit the maximum possible packing efficiency of $74\%$ for identical spheres.