Molecule
A
molecule /ˈmɒlɪkjuːl/ is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term
molecule is often used less strictly, also being applied to polyatomic ions. In the kinetic theory of gases, the term
molecule is often used for any gaseous particle regardless of its composition. According to this definition, noble gas atoms are considered molecules despite being composed of a single non-bonded atom. A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen; or it may be a chemical compound composed of more than one element, as with water. Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules. Molecules as components of matter are common in organic substances. They also make up most of the oceans and atmosphere.