Answer:
Covalent solids: Solids in which constituent particles are held together by a network of covalent bonds throughout the crystal are called covalent solids.
Examples: Diamond, graphite, silica (quartz), carborundum (silicon carbide).
These are also called network solids. Covalent solids are made of non-metallic atoms. These atoms are bound by forming covalent bonds between adjacent atoms throughout the crystals. These solids have giant structures.
Properties of covalent solids
(a) In covalent solids atoms are held very strongly by strong and directional covalent bonds therefore these solids are very hard.
(b) These solid have extremely high melting points.
(c) They have no free electrons hence these are insulators.
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