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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.
Molecules associated with living organisms are organic. These include nucleic acids, fats, sugars, proteins, enzymes and many fuels. Inorganics include salts, metals, substances made from single elements and any other compounds that don't contain carbon bonded to hydrogen. There are few organic compounds that don't contain carbon-hydrogen bonds. Examples of these exceptions include: Intro to Organic Chemistry.