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370
Democritus
matter is not divisible, but made up of particles called "atomos" -
John Dalton
Matter is composed of atoms. All atoms of an element are identical. Atoms cannot be created or destroyed. -
Dmitri Mendeleev
sorts elements by mass and similarities -
J.J. Thomson
proves Dalton's theory has flaws...atoms can be broken up into subatomic particles....(Electron)
