The option that contains an example of a polyatomic ion is KNO3.
The option that contains an example of a polyatomic ion is KNO3. To determine this, we need to know the definition of a polyatomic ion. A polyatomic ion is a charged particle composed of two or more atoms bonded together. In this case, KNO3 consists of a potassium (K+) ion bonded with a nitrate (NO3-) ion. The nitrate ion is an example of a polyatomic ion, as it is composed of nitrogen and three oxygen atoms bonded together.
