Covalent solids are formed by chemical bonds i.e. covalent bonds between the neighbouring constituent atoms of non-metallic solids. Covalent solids are also called giant solids. The solids may be hard or brittle depending on the type of covalent bonding between the atoms and possess high melting points. Depending upon availability of mobile electrons, they are either good conductors of electricity or act as insulators. The examples of covalent solids are three allotropic modification of carbon i.e. diamond, graphite and fullerene.
1) Diamond
2) Graphite
3) Fullerence
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