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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 elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle â¦ st component of any element having all the  chemical properties of that specific element.toms of elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle â¦ st component of any element having all the  chemical properties of that specific element.