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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: the basic unit of a chemical element Molecules: a group of atoms bonded together. Elements: substances that canât be broken down into simpler substances Compounds: something made of 2 or more separate elements -a mixture. How are they related? Theyâre all related to atoms. Molecules and elements are made of atoms and elements make up compounds. Molecules and compounds are related because theyâre both made up of other things and atoms and elements both canât be broken down.