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486 BCE
Leucippus and Democritus
These were the people that came up with the theory of matter being made out of tiny particles. -
486 BCE
The 1st Understanding
At first they thought that if cut something in half so many time, you'll reach a particle that can't be cut anymore -
Antoine Lavoiser
Proposed the law of conservation -
John Dalton
Determined that elements exist as discrete packets of matter -
Discharge Tubes
These are gas-filled tubes with electrodes at each end which emits light -
Eugen Goldstein
Found that the tubes also emits light with positive electrodes -
JJ Thomson
Took the tube research further; He was able to measure the mass rays; He concluded that the rays weren't rays or waves they were very small and light negative particles. (Pretty much created electrons) -
Quantum Theory
Proposes that electrons weren't particles or waves instead they had properties of both and neither -
Earnest Rutherford
Designed an experiment using an extremely thin sheet of gold foil and screen created with zinc; concluded that most of an atom is just empty space. -
Werner Heisenberg
Discovered that its impossible to know with certainty the momentum of an electron or any subatomic particles
