History of the atom Timeline by Jacob and Amiya

Democritus (400 B.C.)

100

Bennett, Linda. "What Democritus Thought." Democritus Model. N.p., 2012. Web. 26 Feb. 2015.Democritus said that atoms are invisible and indivisble particles of matter that were ungenerated. He also said that atoms differ from size, shape, and position. Changed the previous model because he found out that they were electrons.

Dalton

Feb 25, 1787

Bennett, Linda. "What Dalton Discovered." Dalton's Model. N.p., 2012. Web. 26 Feb. 2015.He stated that atoms can be destroyed via nuclear reactions but not by chemical reactions.

Thomas

Feb 25, 1900

Bennett, Linda. "What Thompson Discovered." Thompson's Model. N.p., 2012. Web. 26 Feb. 2015.Was the first too suggest that elements were 1000 times smaller than the real size of an atom.

Rutherford

Feb 25, 1908

Bennett, Linda. "What Rutherford Discovered." Rutherford. N.p., 2012. Web. 25 Feb. 2015.He found that when alpha and beta changes were used at the same time they caused a chemical chang across atoms. Alpha particles resume the nucleus .

Bohr

Feb 25, 1912

Bennett, Linda. "What Bohr Discovered." Bohr's Model. N.p., 2012. Web. 25 Feb. 2015.Niels Bohr theory was based on an earlier proposed by Ernist Rutherford. Proposed that the electrons could only orbit around the atom in larger orbits outside the atom. He thought that outer orbits could had more electrons than the inner ones.

Heisenberg and Schrodinger

Feb 25, 1926

B. "Schrödinger's Atom." Schrödinger's Atom. Science Trek, 2000. Web. 26 Feb. 2015.Schrodinger deceloped the equation now known as the "Schrodinger equation" . Heinsberg developed math equations