Covalent network crystals
i.The constituent particles in covalentnetwork solids are otems.
ii. The atoms in these crystals are linked by a continous system of covalent bonds. The result is a rigid three dimensional network that forms a giant molecule. The entire crystal is a single molecule
iii. As a result of ngid and strongly bonded structure, covalent network crystals are very hard. In fact they are the hardest and most incompressible of all the materials. These crystals have high melting and boiling points.
iv. The electrons are localised in covalent bonds and hence are not mobile. As a result, covalent solids are poor conductorsof heat and electricity.
For example diamond, quartz (SiO), boron nitride, carborandum are covalent network solids
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