Question

which is an example of a polyatomic ion?
h₂
co₃
mg⁺
ne⁺

Explanation:

A polyatomic ion is an ion composed of more than one atom. \(H_2\) is a molecule (not an ion). \(Mg^{+}\) and \(Ne^{+}\) are monatomic ions (composed of a single atom). \(CO_3\) is likely a typo for \(CO_3^{2 -}\) (carbonate ion), which is a polyatomic ion composed of carbon and oxygen atoms.

Answer:

\(CO_3\) (assuming it is \(CO_3^{2 -}\)) is the example of a polyatomic ion.