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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 came into being when two or more atoms interact chemically and combine together. Compound is also a molecule but it contains atom of minimum two or more elements. Generally all compounds can be considered as molecules but are molecules are not compound.A molecule can be most appropriately defined as a group of atoms tied in a definite arrangement. compound is a substance that is made up of two or more elements having chemical bond between each other in a permanent percentage by mass. A molecule is the smallest part of a compound. One or more atoms that are chemically unite to form a molecule.