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A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atom s that are held together by chemical bonds.or example, O 2 is the oxygen molecule most commonly found in the earth's atmosphere; it has two atoms of oxygen. However, under certain circumstances, oxygen atoms bond into triplets (O 3), forming a molecule known as ozone.
Molecule. the smallest particle of a substance that can exhibit all the chemical properties of the substance. A molecule is composed of atoms (more precisely, of atomic nuclei, their surrounding inner electrons, and their outer valence electrons, which form a chemical bond). The inner electrons of atoms usually do not participate in the formation of such bonds. The molecular composition and structure of a given substance do not depend on the method of preparation used. In the case of monatomic molecules (for example, inert gases), the concepts of the molecule and the atom are congruent.