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What is the definition of atom?

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atom definition. A unit of matter; the smallest unit of a chemical element. Each atom consists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus. (See Bohr atom.) Note: Atoms link together to form molecules. read more

an atom with one of the electrons replaced by some other particle: muonic atom; kaonic atom. Energy. this component as the source of nuclear energy. a hypothetical particle of matter so minute as to admit of no division. read more

Atom Definition. An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of positively-charged protons and electrically neutral neutrons with negatively-charged electrons orbiting this nucleus. read more

The English word atom came from a Greek word atomos, meaning “not able to be divided.” Ancient Greek philosophers believed that matter could only be divided to the very smallest particles, atoms, which could not be further divided. read more

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