CBSE Class 12 Chemistry Quick Revision Notes Chapter 1 The Solid State Solid : Solid is a state of matter in which the constituting particles are arranged very closely. The constituent particles can be atoms, molecules or ions. Properties of solids : They have definite mass, volume and shape. They are incompressible and rigid. Intermolecular distances are very short and hence the intermolecular forces are strong. Their constituent particles have fixed position. sand can only oscillate about their mean positions. Classification of on the basis of the arrangement of constituent particles:   Properties of crystalline solids : They have a definite geometrical shape. They have a long range order. They have a sharp melting point. They are anisotropic in nature i.e. their physical properties show different values when measured along different directions in the same crystal. They have a definite and characteristic heat of fusion. They are called true solids. When cut with a sharp edged tool