Question

plz define covalent bond with examples

Answer 1

The chemical bond formed by the equal contribution and mutual sharing of electrons between two atoms. so that both the atoms get their octets complete or duplets in case of elements having only on shell,that is acquire the stable nearest Noble gas configuration is called Covalent bond.

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Answer 2

Covalent bonds are chemical bonds formed by the mutual sharing of electrons between atoms.
Single bond: The mutual sharing of a pair of electrons between two atoms
Double bond: the mutual sharing of two pairs of electrons between two atoms
Triple bond: the mutual sharing of 3 pairs of electrons between two atoms.