Solids are closely packed condensed states, with their constituent particles (atoms, ions or molecules) held together by strong physical or chemical bonds. These particles show a definite regular arrangement in a long range order. Solids may be broadly categorised into four types, depending upon the nature of bonds present in them. These are:
- Ionic solids (ionic bonds)
- Covalent solids - (covalent bonds)
- Molecular solids (Van der Waal's bonds)
- Metallic solids (metallic bonds).