-
450
Democritus (400 B.C.)
discovery: 400 B.C.
- that atoms can be broken into smaller parts.
- he has does not have any evidence to support his theory. http://prezi.com/6fkcwpdzacl1/atomic-theory-timeline/ -
450
Aristotle 340 BC
- 450- (340 B.C.)
- matter is made up of the these elements: earth, air, fire, and water
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Dalton
-1808 A.D.
-matter was made up of atoms
- method: used experimental methods to recontruct Democritusi ideas http://www.timetoast.com/timelines/77881
http://prezi.com/6fkcwpdzacl1/atomic-theory-timeline/ -
Thompson
- 1897 A.D .- using cathode ray, that there seemed to be negatively charged particles in atoms making them able to be split even further apart- method: cathode ray rubes
http://prezi.com/6fkcwpdzacl1/atomic-theory-timeline/
http://prezi.com/6fkcwpdzacl1/atomic-theory-timeline/ -
Rutherford
- 1909 A.D.- he discovered the nucleus, and found that inside was a postively charged particle (called a proton)- method: Gold- Foil experiment http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html
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Bohr
1913 A.D.
electrons travled in shells, or certain energy levels around the nucleaus
http://www.timetoast.com/timelines/77881
http://prezi.com/rah1pigp1yeu/development-of-the-atomic-theory/ -
Schrodinger
