Atomic Theory

Aristotle bc

350

.he believed that the 4 elements air, fire, earth, and water
Aristotle." The-History-of-the-Atom -. N.p., n.d. Web. 27 Feb. 2014.

Democritus bc

450

.Discovered that atoms are in constant motion
.Every thing in the universe is composed of atoms
Search | Explore | Prezi." Prezi.com. N.p., n.d. Web. 27 Feb. 2014.

Dalton

Mar 6, 1803

. he decided to call the small particles atoms
. he came up with the atomic theory
John Dalton." John Dalton. N.p., n.d. Web. 27 Feb. 2014.

Thomson

Mar 13, 1897

. used the plum pudding model
. he discovered the electron
. in the plum pudding model, the atoms are composed of electrons
.Plum Pudding Model." Princeton University. N.p., n.d. Web. 12 Mar. 2014.

Rutherford

Mar 11, 1909

.Discovered that atoms contained a nucleas made up of protons, neutrons, and electrons.
.used the gold foil method
. the gold foil experiment shot minure particles at a thin sheet of gold
. a small percentage of the particles were deflected while the majority passed through
Search | Explore | Prezi." Prezi.com. N.p., n.d. Web. 27 Feb.
.ChemTeacher." ChemTeacher. N.p., n.d. Web. 12 Mar. 2014.