3. What are polyatomic ions? Give examples.
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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.
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So, polyatomic elements can be regarded as those ions in which more than two atoms are present with either positive or negative charge. Some examples are: ... C2H3O−2, this acetate ion, and it is regarded as polyatomic ion because it has two carbon, three hydrogen, and two oxygen atoms and it has a negative charge.
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