Question

which option contains an example of a polyatomic ion? (1 point) mgcl o₂ cacl₂ kno₃

Explanation:

A polyatomic ion is an ion composed of two or more atoms. In \(KNO_3\), the \(NO_3^-\) (nitrate) is a polyatomic ion. \(MgCl\) is incorrect as magnesium chloride is \(MgCl_2\) (composed of \(Mg^{2 +}\) and \(Cl^-\) monatomic ions). \(O_2\) is a molecule (not an ion). \(CaCl_2\) is composed of \(Ca^{2+}\) and \(Cl^-\) monatomic ions.

Answer:

\(KNO_3\)