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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.
What are the molecules that make up DNA? There are six molecules that make up DNA. These are: a five carbon sugar called deoxyribose, a phosphate group and four nitrogenous bases, which are thymine, guanine, aden â¦ ine, thymine and cytosine.