A crystalline solid is a material in which the atoms, molecules, or ions are arranged in a regular, repeating pattern. This arrangement gives crystalline solids a number of characteristic properties, such as a sharp melting point, a well-defined shape, and the ability to diffract light.
Rubber and glass are both amorphous solids. This means that their atoms, molecules, or ions are not arranged in a regular pattern. This gives amorphous solids a number of properties that are different from crystalline solids, such as a lack of a sharp melting point, a non-uniform shape, and the inability to diffract light.
