atomic-theory

atomic theory

noun
1.
Physics, Chemistry. any of several theories describing the structure, behavior, and other properties of the atom and its component parts.
2.
Philosophy, atomism ( def 1 ).

Origin:
1840–50

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World English Dictionary
atomic theory
 
n
1.  any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
2.  See atomic structure the current concept of the atom as an entity with a definite structure

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