<P> A molecule 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 . </P> <P> 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 as they are in fact monoatomic molecules . </P>

When is a particle classified as a molecule
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