Copper has a face-centered cubic (fcc) crystal structure, also known as A1 in the Bravais lattice classification. This structure is characterized by atoms located at each corner of a cube and at the centers of all cube faces. Space Group: Fm-3m (No. 225) Lattice Constant: Approximately 361.5 pm at 20 °C Atoms per Unit Cell: 4 Coordination Number: 12 (each copper atom is surrounded by 12 nearest neighbors) Atomic Packing: The fcc structure allows for high atomic density, contributing to copper’s high electrical and thermal conductivity.