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Democritus
Found that all matter is divided into smaller and smaller pieces until single indivisible particle was reached (atom)
John Dalton
- All matter is composed of tiny indivisible particles called atoms
- all atoms of the same element have identical properties
- atoms of different elements have different properties
- Law of Constant Composition
- Law of Conservation mass
Law of Constant Composition
Atoms of two or more elements can combine in constant ratios to form new substance
Law of Conservation of Mass
In a chem reaction, atoms join together or separate but are not destroyed
J.J Thompson
- provided evidence of electrons
- a
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Flashcard (43)