atomic theory

1. The theory that all gross matter is composed of atoms.

   (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles

2. Any of several theories that explain the structure of the atom, and of subatomic particles.

   a theory of the structure of the atom

1. John Dalton created the Atomic Theory.

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2. John Dalton was the creator of the atomic theory.

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