What are poly - atomic ions ? Give two 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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any ion which is made up of differen type atoms ....
Eg:- NH 4+ , NO +
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