A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and molecule is often used when referring to polyatomic ions. A molecule may be homonuclear, that is, it consists of atoms of one chemical element, e.g. two atoms in the oxygen molecule; or it may be heteronuclear, a chemical compound composed of more than one element, e.g. water. In the kinetic theory of gases, the term molecule is often used for any gaseous particle regardless of its composition. This relaxes the requirement that a molecule contains two or more atoms, since the noble gases are individual atoms. Atoms and complexes connected by non-covalent interactions, such as hydrogen bonds or ionic bonds, are typically not considered single molecules.

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Physicists observe rare resonance in molecules for the first time

Fires in a microgravity environment (like the space station) are fed by random oxygen molecules stumbling into them in a process called molecular diffusion. This produces spherical flames that burn more slowly and consume less oxygen, giving off a fraction of the heat emitted by terrestrial flames.

Incorporation of water molecules into layered materials impacts ion storage capability

Electronic nose: Sensing the odor molecules on graphene surface layered with self-assembled peptides

New 'chain mail' material of interlocking molecules is tough, flexible and easy to make

Green environments in residential areas impact the composition of sugar molecules in breastmilk

One-pot reaction creates versatile building block for bioactive molecules

Mars meteorite with organic molecules holds clues to chances of ancient life

AI Being Used To Pinpoint Most Therapeutic Molecules in Psychedelics

Mucus Molecules Could Prevent Cholera

Not Just Waistlines: Exercise Can Change the Very Molecules in the Human Body That Influence How Genes Behave

Novel synthesis process for a sustainable use of small molecules

Scientists Identify Tiny Molecules That Could Reduce the Likelihood of Infants Developing Eczema, Asthma, and Food Allergies

Electrochemistry converts carbon to useful molecules

How the first life on Earth survived its biggest threat — water. Living things depend on water, but it breaks down DNA and other key molecules. So how did the earliest cells deal with the water paradox?

Researchers at UC San Francisco have engineered molecules that act like “cellular glue,” allowing them to direct in precise fashion how cells bond with each other. The discovery represents a major step toward building tissues and organs, a long-sought goal of regenerative medicine.

Molecules have an orientation, and scientists have a new way to measure it

Seaweed molecules used to improve outcomes for bypass surgery

Automation enables modular synthesis of new molecules for lasers

Molecules change their behaviors under a polariton leader