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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 AtomFor alternative meanings see atom (disambiguation). An atom is a microscopic structure found in all ordinary matter around us. Atoms are composed of 3 types of subatomic particles: electrons, which have a negative charge; protons, which have a positive ch 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 clock Atomic absorption spectroscopy Atomic theory Atom probe Atomic weight Atomic mass Atomic mass unit Atonality Atoll