-
112
Aristotle 113 B.C.
Aristotle opposed the atomic theroy. He thought that matter was made of air,water,fire,and earth. http://scienceblogs.com/dotphysics/2009/09/04/the-development-of-the-atomic-model/ -
400
Democritus
Democritus discovered that atoms can't get cut down an infinite amount of times about 2400 years ago. He made observations to do his discovery. The atom was invisible and still today. http://profmokeur.com/chemistry/history_of_the_atom.htm -
Dalton 1803
He discorved that oxygen and carbon were a combined to make two compounds. He called his model "The Billiard Ball". http://dl.clackamas.cc.or.us/ch104-04/dalton's.htm -
Rutherford 1911
He discorverd that the only way particles could be deflected is if the mass was focused in the nucleus. He discarded the plum model and used his planetary model. http://scienceblogs.com/dotphysics/2009/09/04/the-development-of-the-atomic-model/ -
Bohr
A small positively charge surrounded by electrons that travel in orbits around the nucleus. He proposed energy levels of electrons are discrete. The model was called "electron configiration". http://profmokeur.com/chemistry/history_of_the_atom.htm -
Heinsenberg and Schrodinger
Heinsenberg explained the next level of energy. He found the interacting waves. He made observations about his discovery too. He discovered that it will ever be smaller. http://scienceblogs.com/dotphysics/2009/09/04/the-development-of-the-atomic-model/
