Exploring Crystalline and Ionic Solids

Exploring Crystalline Ionic Solids.
Crystalline solids have a regular internal arrangement of particles, a long range order, and sharp melting points. They are hard and rigid, with a characteristic heat of fusion. They are anisotropic, meaning their physical properties, such as refractive index, conductivity, and thermal expansion, differ in different directions due to the orderly arrangement of particles. Crystals of NaCl, CsBr, CaF2, and ZnS exhibit this regularity.