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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 normal molecule contains a few atoms of certain elements. Water for example consists of 2 H atoms and 1 O atom. Macromolecules are just really big molecules. Certain plastics, for example polymers, are basically one big molecule containing a lot of C and H and O and some other elements. DNA is also an example.