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Classification and Properties of Solids

Solids are broadly classified into two types: crystalline solids and amorphous solids.

 

CRYSTALLINE SOLIDS

A crystalline solid is a substance whose constituent particles possess a regular orderly arrangement. Some examples of crystalline solids are sodium chloride (rock salt), sucrose (sugar), diamond and quartz.

 

AMORPHOUS SOLIDS

 An amorphous solid is a substance whose constituent particles do not possess a regular orderly arrangement. Some examples of amorphous solids are glass, plastics, rubber, starch, etc. Quartz is a crystalline form of silica (SiO2).