- In 300BC Democritus said atoms were indivisible particles. It was not a testable theory, only a conceptual theory.
Lavoisier
- Law of conservation of mass
- Law of definite proportions
Proust
- If a compound is broken down into its constituents the procedure exist in the sam ration as the compound
Dalton
- Atoms are solid, indestructable spheres
JJ Thompson
- Rasin Bun Model
- Solid positive spheres, with negative particles embedded in them.
- First atomic theory to have positve protons and negative charges
Rutherford
- Show that atoms have a positive, with electrons outside it
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