What is. Polyatomic ions? Give example.
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A group of atoms carrying a charge is known as polyatomic ion, example of polyatomic cation: NH4+ and polyatomic anion: NO3-.
Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.