atomic
adjective1678{ds||1|a|}
- of, relating to, or concerned with atoms
- nuclear
- marked by acceptance of the theory of atomism
atomic bomb
noun
atomic bomb
\
1914{ds||1||}
- a bomb whose violent explosive power is due to the sudden release of energy resulting from the splitting of nuclei of a heavy chemical element (such as plutonium or uranium) by neutrons in a very rapid chain reaction —called also atom bomb
- a nuclear weapon (such as a hydrogen bomb)
atomic clock
noun
atomic clock
\
1924
- a precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (such as a beam of cesium atoms)
atomic force microscope
noun
atomic force microscope
\
1986
- an instrument used for mapping the atomic-scale topography of a surface by means of the repulsive electronic forces between the surface and the tip of a microscope probe moving above the surface —abbreviation AFM
atomic layer deposition
noun
atomic layer deposition
\
1991
- a technique for depositing a film onto a surface in monolayers by utilizing a self-limiting chemical reaction
atomic mass
noun
atomic mass
\
1874
- the mass of an atom usually expressed in atomic mass units; also : atomic weight
atomic mass unit
noun
atomic mass unit
\
circa 1942
- a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most abundant carbon isotope 12C —called also dalton
atomic number
noun
atomic number
\
1913
- an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table
atomic reactor
noun
atomic reactor
\
1942
- reactor
atomic theory
noun
atomic theory
\
1738{ds||1||}
- a theory of the nature of matter: all material substances are composed of minute particles or atoms of a comparatively small number of kinds and all the atoms of the same kind are uniform in size, weight, and other properties
- any of several theories of the structure of the atom; especially : one based on experimentation and theoretical considerations holding that the atom is composed essentially of a small positively charged comparatively heavy nucleus surrounded by a comparatively large arrangement of electrons
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