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what are polyatomic ions?give examples

A polyatomic ion, also known as a molecular ion, is a charged species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit in the context of acid and base chemistry or in the formation of salts. 

Examples are Nitrate ( NO3-1) , Sulphate(SO4-2) etc.

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 group of atoms carrying charge are called polyatomic ions....

ex-  HCO3 -  

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 A polyatomic ion, also known as a molecular ion, is a charged species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered as acting as a single unit in the context of acid and base chemistry or in the formation of salts. .

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