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( Molecules) In chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two atoms in a definite arrangement held together by very strong chemical bonds. It can also be defined as a unit of two or more atoms held together by covalent bonds.^[1][2] Molecules are distinguished from polyatomic ions in this strict sense. In organic chemistry and biochemistry, the term molecule is used less strictly and also is applied to charged organic molecules and biomolecules.

This definition has evolved as knowledge of the structure of molecules has increased. Earlier definitions were less precise defining molecules as the smallest particles of pure chemical substances that still retain their composition and chemical properties.^[3] This definition often breaks down since many substances in ordinary experience, such as rocks, salts, and metals, are composed of large networks of chemically bonded atoms or ions, but are not made of discrete molecules.

In the kinetic theory of gases the term molecule is often used for any gaseous particle regardless of their composition.^[4] According to this definition noble gas particles are considered molecules despite the fact that they are composed of a single non-bonded atom.

A molecule may consist of atoms of the same chemical element, as with oxygen (O₂), or of different elements, as with water (H₂O). Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules.

Molecules Subcategories Molecules Articles Amino Acids and You by R. Fredricksen We have all heard of amino acids, but what do they do? For starters, amino acids are needed to maintain, restore and repair damaged muscles, tendons, breaks in the skin structure, and all tissues like the ligaments, the tissues of the organ systems, ... Ageing Skin Care - Know More About Common AHA Molecules by cd mohatta AHAs are becoming very popular in the fight against ageing skin and are getting added to most of the beauty and skin care products. AHAs are one of the ingredients that help us keep skin looking young for a longer time. Let us find out about common A...