Molecule

Molecule is defined as a group of atoms (at least two) that each bind with very strong (covalent) in a specific arrangement and electrically neutral and fairly stable. According to this definition, different molecules with polyatomic ions. In organic chemistry and biochemistry, the term is used in a less rigid molecule, so that the organic molecules and biomolecules including uncharged molecules were considered.

In the kinetic theory of gases, the term molecule is often used to refer to particles of any gas without relying on its composition. According to this definition noble gas atoms is considered as a molecule, although these gases consist of a single atom is not bonded.


A molecule may consist of atoms berunsur same (eg oxygen O2), or composed of different elements (eg water H2O). Complex atoms and associated non-covalently (eg bound by hydrogen bonds and ionic bonds) is generally not regarded as a single molecule.