History Of The Atom Timeline By Payton Brown and chris

Democritus Atom Theory

400

Democritus Believed that atoms make up matter.
He thought that atoms are small spheres that can't be any smaller.At this time no one believed him, but later his idea was rethought at was correct."Democritus." The-History-of-the-Atom -. N.p., n.d. Web. 11 Feb. 2015.

John Dalton

Feb 25, 1803

John Dalton had the idea that an element connsists of particullar types of atoms. He used his theory, when atoms combine and progress a particular compound, they always combine. He thought the atom loooked like a bunch of balls, connecting and departing.
"World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. N.p., n.d. Web. 25 Feb. 2015.

Thomson's Atom Discovery

Dec 25, 1897

He discovered the electron, he was shooting electric discharge in a high vacuum tube and he saw bodys much smaller than atoms. "Joseph John Thomson | Chemical Heritage Foundation." Joseph John Thomson | Chemical Heritage Foundation. N.p., n.d. Web. 11 Feb. 2015.

Rutheford's Model of The Atom

Nov 1, 1905

Rutherford discovered that atoms have a nucleus and electrons circled around the atom. He found this out by shooting electric charge into a gold foil and some bounced back."What Rutherford Discovered." Rutherford. Linda Bennett, n.d. Web. 20 Feb. 2015.

Neils Bohr

Feb 25, 1913

Neils Bohr used the Quantum Theory to make his disovery Described the electrons as orbits like planets around the sun. World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. N.p., n.d. Web. 25 Feb. 2015

Heisenberg and Schrodinger

Feb 25, 1914

They invented The Quantum Theory their idea of the atom was the same as Bohr. World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. N.p., n.d. Web. 25 Feb. 2015.