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