Crystal structure

This document discusses crystal structures and their importance in determining material properties. It defines key terms like crystal lattice, basis, unit cell and crystal systems. There are two main types of solids - crystalline and amorphous - based on atomic arrangement. Common metallic crystal structures are face-centered cubic, body-centered cubic and hexagonal close-packed. Face-centered cubic structure is described in detail, where atoms are located at unit cell corners and centers, giving a coordination number of 12. Crystal structures are crucial for understanding the properties and behaviors of different materials.