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Aristotle believed that all matter was made of the Four Elements: Fire, Earth, Air, and Water- theory https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245
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Democritus believed that if you break down an objects enough times, eventually you wouldn't be able to break it down any smaller, and that piece is called an atom- theory https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245
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Dalton believed that different atoms bonded to create different things and that they were indivisible- theory
Thompson also created a mass spectrograph which found isotopes. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245 http://www.universetoday.com/38169/john-daltons-atomic-model/ -
Thomson believed that atoms were made of electron; he changed the previous model by saying atoms were not indivisible- theory https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245
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Rutherford discovered that stoms had a nucleus with all positive charge was in the center; he changed the previous model by saying atoms had a nucleus.
He gathered evidence by using the gold foil expirement. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245 -
He discovered that electrons orbit around the nucleus.
He changed the previous model by saying electrons orbited in a circular motion around the nucleus. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245 -
The discovered that electrons move around the nucleus quickly in a sphere. He made the previous atom more accurate by adding properties such as velocity and position. He came up with the electron cloud. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245
