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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.
Molecules are often defined as the smallest part of a chemical compound formed from the bonding of atoms of different elements, but a molecule can also consist of a bond between the same type of atom, such as two hydrogen atoms bonding to form a hydrogen (H2) molecule.