-
400
Aristotle
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 -
460
Democrotus
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 -
Dalton
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
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 -
Rutherford
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 -
Bohr
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 -
Heiseburg and Schrodinger
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
