atomic theory(redirected from Atom theory)
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that chemical compounds are formed by the union of atoms in certain definite proportions; in its modern form, first advanced in 1803 by John Dalton.
Farlex Partner Medical Dictionary © Farlex 2012
1. The theory that all matter is composed of atoms.
2. Theories pert. to the structure, properties, and behavior of the atom.
See also: theory
Medical Dictionary, © 2009 Farlex and Partners