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A molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above.The two balls represents the two oxygen molecules. molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above.
A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements.ater (H 2 O), carbon dioxide (CO 2) and methane (CH 4) are compounds because each is made from more than one element. The smallest bit of each of these substances would be referred to as a molecule.