CBSE
Class 10 Class 12
Solids are classified as crystalline and amorphous on the basis of the order of arrangement of constituent particles.
| Crystalline solid | Amorphous solid |
| Solids which have regular orderly arrangements of constituent particles (Long range order) |
Solids which have an irregular arrangement of constituent particles Short range order. |
| They have a sharp melting point. | They melt over a range of temperature. |
| They give regular structure on cleavage. | They give irregular structure cleavage. |
| They are anisotropic, i.e.; they have different optical and electrical properties in different directions due to different arrangements of particles in different directions. | They are isotropic, i.e.; the value of physical properties is same in all directions due to the irregular arrangement in all directions. |
| They have high and fixed heat of fusion. | They do not have fixed heat of fusion. |
| For example, Diamond, Graphite, NaCl, Metal (Fe, Cu, Ag etc) ice. | For example, Glass, rubber, plastics, Quartz glass. |
