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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 molecule of water is made of the the elements Hydrogen and Oxygen-two atoms of Hydrogen combined with one atom of oxygen. Sugar (C12H22O11) is made up of 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.Many elements in particular the gases occur naturally as molecules e.g.olecules may be â¦ made up of atoms of the same element such as Hydrogen gas (H2 - two atoms of Hydrogen), or atoms of different elements such as Sodium Chloride (NaCl).