# What are polyatomic ions? Give examples.

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Hint: There are many types of ions like monatomic ion, diatomic ion, polyatomic ion, etc. The mono, di, and poly tell the number of atoms in the ion. $NO_{3}^{-}$ is a nitrate ion that is regarded as a polyatomic ion.

$NO_{3}^{-}$, this is nitrate ion and it is regarded as a polyatomic ion because there is one nitrogen and three oxygen atoms and it has a negative charge.
$SO_{4}^{2-}$, this is sulfate ion and it is regarded as a polyatomic ion because there is one sulfur and four oxygen atoms and it has a -2 charge.
$NH_{4}^{+}$, this is ammonium ion or ammonium cation and it is regarded as a polyatomic ion because it has one nitrogen and four hydrogen atoms and it has a positive charge.
${{C}_{2}}{{H}_{3}}O_{2}^{-}$, 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.
In monatomic ions only one atom is present like $N{{a}^{+}},\text{ }{{F}^{-}},\text{ C}{{\text{l}}^{-}}$, etc and in diatomic ions there are two atoms present like $C{{N}^{-}},\text{ O}{{\text{H}}^{-}},\text{ O}_{2}^{-}$. The polyatomic ions are used as ligands in coordination compounds.