Compare polyatomic element to compounds

A polyatomic element is an element composed of two or more atoms that are chemically bonded together. Examples of polyatomic elements include carbon dioxide (CO2), water (H2O), and ammonia (NH3).

A compound is a substance composed of two or more different elements that are chemically bonded together. Examples of compounds include table salt (NaCl), sugar (C12H22O11), and baking soda (NaHCO3).