The 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 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. A related concept is atom (measure theory).

// Introduction The fundamental component of chemistry is that it involves matter in some way (this explains its broad reach). ... Properties An atom (Greek άτομον from ά: non and τομον: divisible) is a submicroscopic structure found in all ordinary matter. ... The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements first created in 1869 by Russian chemist Dmitri Mendeleev. ... In physics, a particle is an object, or body, with only a few degrees-of-freedom, including position, and perhaps orientation in space. ... Particles erupt from the collision point of two relativistic (100GeV) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... Wikibooks Wikiversity has more about this subject: School of Computer Science Open Directory Project: Computer Science Downloadable Science and Computer Science books Collection of Computer Science Bibliographies Belief that title science in computer science is inappropriate Categories: | ... ... Order theory is a branch of mathematics that studies various kinds of binary relations that capture the intuitive notion of a mathematical ordering. ... In mathematics, a singleton is a set with exactly one element. ... Set theory is the mathematical theory of sets, which represent collections of abstract objects. ... An atom in a poset P with least element 0, is an element that is minimal among all elements that are unequal to 0. ... In mathematics, more precisely in measure theory, an atom is a measurable set which has positive measure and contains no smaller set of positive measure. ...

Other

• " Atomic" is the name of a song by American band Blondie.
• Atomic is the name of the band Lit's 3rd CD.
• Atomic is an Austrian ski producer.
• Atomic is also an Australian computing and technology magazine.
• Atomic is a Norwegian jazz quintet.

This is a test Atomic was the third single from the 1979 album Eat to the Beat by Blondie. ... Cover of the 1976 album Blondie Blondie is a rock band that first gained fame in the 1970s and early 1980s. ... Lit is a pop punk band based in Orange County, California which was formed in 1990. ... Atomic is a ski producer located in Altenmarkt, Salzburg, Austria. ... Atomic (or Atomic MPC) is an Australian magazine and online community dedicated to computing and technology, with an emphasis on gaming and computer hardware. ... A collection of magazines A magazine is a periodical publication containing a variety of articles, generally financed by advertising and/or purchase by readers. ... Atomic is a Norwegian / Swedish jazz band formed in 1999. ...