Noun atomic theory has 2 senses

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

• 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