History of Chemistry

Carbon Dioxide Discovered

Jan 1, 1754

Joseph Black of Scotland discovered the existence of the gas, carbon dioxide, and called it "fixed air." INFO: http://www.historyworld.net/timesearch/default.asp?conid=static_timeline&timelineid=394&page=1&keywords=Chemistry%20timeline

Dalton

Jan 1, 1807

John Dalton proposed the atomic theory and the law of partial pressure of gases. INFO: http://chemistry.about.com/cs/history/a/aa020204a.htm

First accepted Periodic Table

Mar 6, 1869

Dmitri Mendeleev created the first periodic table of the elements that was accepted by the majority of scientists, and it arranged them by increasing atomic weight, 7 groups. INFO:http://chemistry.about.com/cs/history/a/aa020204a_2.htm
PIC:http://www.rsc.org/Education/Teachers/Resources/periodictable/scientists/index.htm?mendeleev.htm

X-Rays Discovered

Jan 1, 1895

William Roentgen discovered x-rays while performing an experiment on the glow of cathode rays in a dark room and instead discovered x-rays. INFO:http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html
PIC:http://www.wired.com/thisdayintech/tag/wilhelm-roentgen/

Thomson

Jan 1, 1897

J.J. Thomson found that cathode rays were negatively charged, which led him to figuring out that all atoms have negative charges, naming them electrons. He made an atom model of a positively charged substance with negative charges stuck in it. "plum-pudding model" INFO:http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html

Bohr

Jan 1, 1913

Niels Bohr created the quantum model of the atom in which the positive atom is surrounded by orbiting electrons. INFO:http://chemistry.about.com/cs/history/a/aa020204a_2.htm
PIC:http://homepages.ius.edu/gkirchne/chem.htm

Rutherford

Jan 1, 1919

Sir Ernest Rutherford was first to perform a transmutation reaction, proved radioactive decay of heavy elements and discovered radioactive elements' half-lives. INFO:http://chemistry.about.com/cs/history/a/aa020204a_2.htm
PIC:http://www.3rd1000.com/nuclear/cruc18.htm

Neutron Discovered

Jan 1, 1932

James Chadwick of Manchester, England, discovered the neutron. INFO:http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html
PIC:http://www.chemistryexplained.com/Ce-Co/Chadwick-James.html

Radiocarbon Dating

Jan 1, 1949

Willard Libby developed radiocarbon dating. INFO:http://www.historyworld.net/timesearch/default.asp?conid=timeline&getyear=1850&keywords=%20%20%20Chemistry%20timeline
VIDEO:http://science.howstuffworks.com/environmental/earth/geology/carbon-14.htm