(1) Those solids whose atoms, ions or molecules are arranged in a regular and repeated manner extending in three dimensions are called crystalline solids.
(2) There are cohesive (attractive) forces among the atoms. Due to the presence of these force, crystalline solids maintain long range orders.
(3) Atoms or molecules of the crystalline solids vibrate about their fixed positions but the cohesive forces do not allow them to leave their positions.
(4) Crystalline solids have definite melting point. The crystal order breaks at this temperature.
(5) Metals like zinc, copper and iron have crystalline structure. Other examples of crystalline solids are NaCl, sucrose and diamond.
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