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May 2, 1000
Democritus
His theory said that all matter consisted of snaller particles that couldn't be divided.He asked a question thats is if you break matter then how many times couldyou break it again untill you can't? -
Sep 5, 1000
Aristole
He belived that there was no limit on the amount of times matter could be divided And all subbstances were made up of the 4 elements fire, air, water, and cold. His model described matter. -
John Dalton
Daltons theory said that all matter is made up of induvidual particles which are atoms that cannot be dividedd -
J.J Thompson
Thompsons therory that atoms are made of even smaller particles.In his experiment he used an electric current and they helped prove his theory. -
Hantaro Nagaoka
He said that electrons move in orbit and that am atom had a central nucleus. -
Ernest Rutherford
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Neils Bohr
He proved that electrons gain or lose energy when theymove between energy levals and that electrons move in circular orbit around the nucleus. -
Ernest Marsden
He did experiments that made a beaam pass throungh gold foil. His theory said that an atom has a dense positvly charged nucleus, and the electrons move randomly in the space around it. -
Louis De Broglie
He said electrons have propeties like waves -
James Cadwick
He said there were different partickes in an atoms nucleus and he found that there were protons and neutrons in the nucleus. -
Erwin Schrodinger
He did math equations to come up with the Electron Cloud Model.
