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322
Aristotle
384-322 B.C.
-Stated that empty space cannot exist
-Had a theory that all matter was made of four elements
-Elements: Fire, Earth, Water, Air -
Period: 322 to
Aristotle
384-322 B.C.
-Stated that empty space cannot exist
-Had a theory that all matter was made of four elements
-Elements: Fire, Earth, Water, Air -
Period: 370 to 460
Democrtius
460-370 B.C.
-Came up with the idea of atoms(atomos)
-Stated that atoms move through empty space -
400
Democritus
460-370 B.C.
-Came up with the idea of atoms(atomos)
-Stated that atoms move through empty space -
John Dalton
-Dalton's Atomic Theory
-6 Statments
-Stated atoms are indivisble and indestructible -
Sir William Crookes
-Cathode Ray
-Light came from Cathode Tube
-Led to the invention of the Television -
JJ Thomson
-Founder of the Electron
-Plum Pudding Model
-Conducted Experiments with the Cathode Tubes
-Charge-to-mass ratio -
Robert Millikan
-Found out the charge of an Electron is negative
-The Oil Drop experiment
-Found the mass of an Electron -
Ernest Rutherford
-Founder of the Nucleus
-Gold Foil Experiment
-Experiment to see how positively charged alpha particles intercated with solid matter. -
Niels Bohr
-Quantom Model of the Atom
-Proposed that Electrons revovle around the Nucleus in stable orbit -
James Chadwick
-Founder of the Neutron and Proton
-Refined the concept of the nucleus
-Showed 2 other subatomic particle, Neutron and Proton, had existed in the nucleus
