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Classification Of Crystalline Solid online notes for 12th class chemistry A  crystal  is defined as a homogenous, anisotropic substance, having a definite geometrical shape with surfaces that are usually planar and have sharp edges. Several types of binding forces are involved in holding crystals together; hence the physical properties of a crystal depend on the type of bonding. Depending upon the type of constituent particles and the nature of intermolecular forces between them, the crystalline solids are classified into following categories: Molecular Solids:  In these solids the particles that are involved are  molecules . Depending upon the nature of the molecules they are further divided into three types. Non-Polar Molecular Solids  -They possess the particles either atoms like those of noble gases or non-polar molecules like H 2 , Cl 2 , I 2  etc. The attractive force between them is weak van der Waal force or dispersion force. Due to this weak force, they have low m