History of the Atom by Frank H. and Brett R.

Democritus (400 B.C.)

111

All things are made of atoms. http://www.universetoday.com/60058/democritus-atom/

Aristotle (400 B.C.)

111

Believed atoms did not exist. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245

Dalton

Feb 27, 1808

All atoms of the same alement are the same and are indivisible. https://www.gaggle.net/gaggleVideoProxy.do?op=view&v=56f60323e745304a6deba9eeba2c9245

Thomson

Feb 27, 1910

Discovered protons and electrons, but did not know how they were arranged. http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html

Bohr

Feb 27, 1913

He discovered that electrons were randomly placed, but were like planets orbiting the sun.

Heisnberg and Schrodinger

Feb 27, 1920

He discovered that electrons went into orbit but were like flies flying around making out random shames