Question

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

Explanation:

A polyatomic ion is an ion composed of more than one atom. In \(KNO_3\), the \(NO_3^-\) (nitrate) is a polyatomic ion. \(CaCl_2\) has \(Ca^{2 +}\) (monatomic) and \(Cl^-\) (monatomic). \(MgCl\) (assuming it's \(MgCl_2\) with \(Mg^{2+}\) and \(Cl^-\) monatomic ions). \(O_2\) is a molecule, not an ion.

Answer:

\(KNO_3\)