Covalent bonding

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Covalency is the sharing of electrons between the atoms of non-metals. A covalent bond is formed when two atoms of non-metal contribute electron(s) equivalent to their valencyValency or Valence of an element is a measure of an atom's ability to combine with other atoms to create molecules or chemical compounds. More for sharing.

After the bonding, both atoms will attain a stable octet or duplet structure of rare gases. Electrons are not transferred because the atoms involved are electron acceptors . The pair of electrons shared is known as