Definition of Unit Cell

A unit cell is the smallest repeating structural unit of a crystalline solid. It is the basic building block that, when repeated in three dimensions, forms the entire crystal structure. The unit cell contains all the structural and symmetry information of the crystal lattice. It is characterized by its shape, size, and the arrangement of atoms, ions, or molecules within it. Understanding the unit cell is crucial for studying the properties and behavior of crystalline materials in chemistry and materials science.