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A network solid or covalent network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
Triple covalent bonds - The covalent bonds in which three pairs of valence electrons are shared between atleast two atoms are known as triple covalent bond. In this image too, focus only on the last shell and you will be able to see three pairs of electrons being shared between two nitrogen atoms.