The correct statement(s) for the packing of identical spheres in two dimensions is/are — Solid State Chemistry Question

💡 Solution & Explanation

In 2D, square close packing has a coordination number of 4 (packing efficiency $\sim 78.5\%$) and hexagonal close packing has a coordination number of 6 (packing efficiency $\sim 90.6\%$). Thus 2D HCP is more efficiently packed. In 2D HCP, there are two triangular voids per sphere, making statement C incorrect. Therefore, correct answer is A,B,D.