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atomic nucleus
(physics) A nucleus of an atom; consisting of protons and neutrons, surrounded by an electron cloud.
hadronic atom
(physics) a hydrogen-like system consisting of an ordinary nucleus with a hadron in orbit.
atomic pile
(physics) an early nuclear reactor fuelled by uranium and moderated with graphite
exotic atom
(physics, chemistry) the equivalent of an atom in which either the nucleus, or an electron, is replaced by some other subatomic particle
atomic battery
(physics) any device that converts the energy of particles emitted from atomic nuclei into electrical energy
atomic bomb
(countable, military) A nuclear weapon that obtains its destructive energy from nuclear fission.
atomic winter
(uncommon) Nuclear winter.
Rydberg atom
(physics, chemistry) Any atom which has a single valence electron in a shell well outside any other electrons in the aton; approximates the hydrogen atom.
atomic weapon
atomic clock
An extremely accurate reference clock whose operation is based on an atomic process, typically the frequency of electromagnetic radiation associated with a specified energy-level transition in an element such as cesium.
