(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
Synonyms:
  1. bohr theory
  2. Dirac theory
  3. atomism
  4. Doctrine of definite proportions
  5. Lewis-Langmuir or octet theory
  6. Rutherford theory
  7. Schr�dinger theory
  8. atomist theory
  9. Thomson's hypothesis
  10. quantum-theory
  11. atomistic theory