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| Crystalline and Amorphous Solids |
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| Solids have definite shape and volume because the average distance between the molecules or atoms remain constant and do not change with time. The arrangement of molecules inside a solid differ from one to another. This results in two types of solids |
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 Crystalline solids |
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 Amorphous solids |
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| In crystalline solids, the atoms or molecules are arranged in an order, extending over a large volume of the crystal. All the bonds have the same bond strength. Therefore, such solids have a precise melting point. They also have a uniform chemical composition. Examples of crystalline solids are quartz, calcite, rocksalt, sugar, mica and diamonds. |
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| Amorphous solids on the other hand, do not have a regular and periodic arrangement of atoms. All the bonds are not equally strong. These solids do not have a precise melting point. |
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| Examples of amorphous solids are rubbers, glass, plastic, cement and paraffin. |
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