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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.
Atoms of the four elements Carbon, Hydrogen, Oxygen and Nitrogen combine with traces of other elements to produce the molecules that make up the building blocks of our cells, amino acids. DNA (deoxyribonucleic acid) in the nucleus of cells acts as both the hardware and software of a system that uses amino acids to create proteins.