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That is, reduced to the smallest possible part. It has more specific meanings in several contexts:

In chemistry, chemical atoms are grouped by type in the periodic table and consist of particles as described by particle physics.

In computer science, an atomic operation is one that cannot be subdivided. Or more specifically, an operation that always completes as a whole, or doesn't complete at all. See atomic (computer science).

In order theory an atom is an abstract generalization of a singleton set in set theory and an atomic element provides an abstract generalization of the ability to select an element from a non-empty set.

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Atomic numberThe atomic number Z is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number. The atomic number originally meant th	AtomicThe general meaning of "atomic" is "irreducible". That is, reduced to the smallest possible part. It has more specific meanings in several contexts: In chemistry, chemical atoms are grouped by type in the periodic table and consist of particles as describ	Atomic physicsAtomic physics (or atom physics is physics of the electron hull of atoms. Lay people often associate the term atomic physics with nuclear power and nuclear bombs, obviously due to the synonymous use of atomic and nuclear in standard English. However, phys
Atomic orbitalAn atomic orbital is the mode of behavior of an electron in an atom (see first Electron orbital). A given orbital is identified by unique values of three quantum numbers: , , and. The various types of orbitals An orbital is uniquely identified by the valu	Atomic semanticsAtomic Semantics is a term which describes the guarantees provided by a data register shared by several processors in a parallel machine or in a network of computers working together. Atomic semantics are defined for a variable with a single writer but mu	Atomic clockAn atomic clock is a type of clock that uses an atomic frequency standard as its counter. Early atomic clocks were masers with attached equipment. Today's best atomic frequency standards (or clocks) are based on more advanced physics involving caesium bea
Atomic absorption spectroscopy	Atomic theory	Atomic weight
Atomic mass	Atomic mass unit	Atomic, molecular, and optical physics
Atomic radius	Atomic nucleus	Atomic City, Idaho