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101
Thales of Miletus 600 B.C.
Thought everything was made from water or made from something else. -
101
Democritus- 460-370 B.C.
Came up with the term "atom." and believing everything is held together by atoms. -
101
Aristotle- 384-322 B.C.
Believed everything was made up from Earth, water, air, and fire. -
Sir Issac Newton- 1704
Atoms are tiny particles that move a ton. -
Dalton- 1803
Mixture of gases for experiment, 5 main points- Atomic Theory -
Antoine Henri Becquerel
Discovered radioactivity and used the Uranium experiment. -
J.J. Thompson- 1897
Discovered the electron. -
Ernest Rutherford- 1904-1911
Discovered that atoms contain a nucleus. -
Gold Foil Experiment 1904-1911
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Robert Millikan 1908-1917
Determined charge and mass of electrons. He completed the Oil Drop Experiment -
Bohr 1915
Created the Bohr model, electrons on fixed paths. -
Francis Aston
Aston studied and discovered the isotope using a mass spectrometer. -
James Chadwick- 1932
Discovered the evidence towards the existance of neutrons. -
Schrodinger
Used math equations to describe the probability of where an electron will be. He discovered the Quantum Model.