Chemistry Timeline

Classification of Minerals

Jan 1, 1800

Berzelius classified minerals according to their chemical composition http://chemistry.about.com/cs/history/a/aa020204a.htm

Dalton's Atomic Theory

Aug 1, 1803

Publishes atomic theory: all matter is composed of atoms, which are small and invisable http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html http://www.brianmicklethwait.com/education/archives/001361.htm

Vacuum Tube

Jan 1, 1854

Heinrich Geissler created the first vacuum tube. http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html http://en.wikipedia.org/wiki/Heinrich_Gei%C3%9Fler

Pitchblend

Oct 18, 1896

Henri Becquerel discovered the pitchblend property of elements

Uranium and Thorium

Oct 18, 1897

Marie Curie discovered Uranium and Thorium http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html

Electrons

Jan 1, 1904

Sir Joseph John Thomson discovered electrons http://www.chemistryexplained.com/Te-Va/Thomson-Joseph-John.html

Radiation

Jan 1, 1911

Rutherford concluded that the atom was mostly empty space by sending radioactive particles through gold he also discovered the three types of radiation (alpha, beta, and gamma) http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html http://cascience6.wikispaces.com/Ernest+Rutherford+09

Bohr Atom Model

Jan 1, 1913

Bohr created a model of the atom that showed negatively charged electrons around the positive nucleus http://chemistry.about.com/b/2011/10/06/on-this-day-in-science-history-october-7-bohr-model.htm http://en.wikipedia.org/wiki/Niels_Bohr

Artificial Radioactive Elements

Oct 18, 1934

Irene Curie and Frederic Joliot-Curie discovered radioactive elements that could be created in a lab http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html http://en.wikipedia.org/wiki/Radioactive_decay