Most of the solids are crystalline in structure, Metallic solids like gold, platinum, silver, copper, zinc, etc. are crystalline solids. Inorganic salts like sodium chloride, magnesium sulphate, potassium bromide, copper sulphate, Cesium Chloride, etc are all crystalline solids. non-metallic solids like sulphur, phosphorus, iodine are crystalline solids. Organic substances like benzoic acid, oxalic acid, camphor, naphthalene, etc are also crystalline solids. All these types of crystalline solids exhibit different physical properties and formed by different types of intermolecular forces of attraction. Crystalline solids are conveniently classified into four main types.
1. Molecular solids
2. Ionic solids
3. Metallic solids
4. Covalent solids