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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.
A molecule is a group of atoms that are bonded together by covalent bonds. Molecular compounds are composed of these molecules. The physical properties of a substance such as melting point, solubility in water, and conductivity of an aqueous solution tell us a lot about the type of particles in a compound.