1.  atomic theory(n = noun.cognition) - a theory of the structure of the atom;
is a kind of scientific theory
is a part of atomic physics, nuclear physics, nucleonics
has particulars: bohr theory, rutherford atom

2.  atomic theory(n = noun.cognition) atomism, atomist theory, atomistic theory - (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe"
is a kind of theory

arrhenius theory of dissociation, association theory, atomic, atomic bomb, atomic clock, atomic cocktail, atomic energy, atomic energy commission, atomic explosion, atomic mass, atomic mass unit, atomic number, atomic number 1, atomic number 10, atomic number 100, atomic number 101, atomic number 102, atomic number 103, atomic number 104, atomic number 105, atomic number 106, atomic number 107, atomic number 108, atomic number 109, atomic number 11, atomic number 110, atomic number 111, atomic number 112, atomic number 113, atomic number 114, atomic number 115, atomic number 116, atomic number 12, atomic number 13, atomic number 14, atomic number 15, atomic number 16, atomic number 17, atomic number 18, atomic number 19, atomic number 2, atomic number 20, atomic number 21, atomic number 22, atomic number 23, atomic number 24, atomic number 25, atomic number 26, atomic number 27, atomic number 28, atomic number 29, atomic number 3, atomic number 30, atomic number 31, atomic number 32, atomic number 33, atomic number 34, atomic number 35, atomic number 36, atomic number 37, atomic number 38, atomic number 39, atomic number 4, atomic number 40, atomic number 41, atomic number 42, atomic number 43, atomic number 44, atomic number 45, atomic number 46, atomic number 47, atomic number 48, atomic number 49, atomic number 5, atomic number 50, atomic number 51, atomic number 52, atomic number 53, atomic number 54, atomic number 55, atomic number 56, atomic number 57, atomic number 58, atomic number 59, atomic number 6, atomic number 60, atomic number 61, atomic number 62, atomic number 63, atomic number 64, atomic number 65, atomic number 66, atomic number 67, atomic number 68, atomic number 69, atomic number 7, atomic number 70, atomic number 71, atomic number 72, atomic number 73, atomic number 74, atomic number 75, atomic number 76, atomic number 77, atomic number 78, atomic number 79, atomic number 8, atomic number 80, atomic number 81, atomic number 82, atomic number 83, atomic number 84, atomic number 85, atomic number 86, atomic number 87, atomic number 88, atomic number 89, atomic number 9, atomic number 90, atomic number 91, atomic number 92, atomic number 93, atomic number 94, atomic number 95, atomic number 96, atomic number 97, atomic number 98, atomic number 99, atomic physics, atomic pile, atomic power, atomic reactor, atomic spectrum, atomic warhead, atomic weight, atomist theory, atomistic theory, big bang theory, big-bang theory, bohr theory, cell theory, communication theory, control theory, corpuscular theory, corpuscular theory of light, domino theory, economic theory, einstein's general theory of relativity, einstein's special theory of relativity, einstein's theory of relativity, field theory, galois theory, game theory, general relativity theory, general theory of relativity, germ theory, grand unification theory, grand unified theory, gravitational theory, group theory, holistic theory, in theory, information theory, international atomic energy agency, kinetic theory, kinetic theory of gases, kinetic theory of heat, malthusian theory, newton's theory of gravitation, ostwald's theory of indicators, philosophical theory, plate tectonic theory, political theory, probability theory, quantum field theory, quantum theory, relative atomic mass, relativity theory, scientific theory, set theory, side-chain theory, special relativity theory, special theory of relativity, string theory, theory, theory of dissociation, theory of electrolytic dissociation, theory of evolution, theory of games, theory of gravitation, theory of gravity, theory of indicators, theory of inheritance, theory of organic evolution, theory of preformation, theory of punctuated equilibrium, theory of relativity, undulatory theory, vortex theory, wave theory, wave theory of light