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Crystals can be classified on the basis of bonding of atoms to form a solid. There are primarily four types of bonding in solids, viz., molecular, ionic, covalent and metallic bonds. |
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Molecular solids are formed by weak inter-molecular forces between molecules. Because of weak binding, the solids have low melting points |
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Metallic solids are characterized by free electrons which move freely through the crystal being bonded to different atoms at different times. |
