He made his own atomic theory.
Dalton's Atomic Theory
1. All matter is composed of extremely small particles called atoms, which cannot be broken into smaller particles, created, or destroyed.
2. The atoms of any given element are all identical to each other and different from the atoms of other elements.
3. Atoms of different elements combine in specific ratios to form compounds.
4. In a chemical reaction, atoms are separated, rearranged, and recombined to form new compounds.