History of Chemistry

Elixar of Life

Jan 1, 1520

Tried not only to convert metals into gold but also find a chemical concoction that would let people live longer and cure dieases. This never happened.
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Dalton's Atomic Theory

Jan 1, 1803

States that all mater is made up of atoms. Those atoms are very smal and indivisible
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Vacuum tube

Jan 1, 1854

Heinrich Geissler created the first vacuum tube
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Cathode Rays

Jan 1, 1879

William Crookes discovered Cathode Rays while using Heinrich Geissler's vacuum tube. Shot electricity through a zinc sulfide tube, the rays were formed in the shape of a cross.
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Radioactive elements

Jan 1, 1897

Marie Curie discovers uranium and thorium in pitchblend. Also found radium and polonium, also found in pictchblend
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J.J. Thomson

Jan 1, 1897

Thomson discovered that Cathod rays were negativly charged. Renamed them electrons. Model of the atom was positive wtih electrons stuck in it.
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Three types of Radioactivity

Jan 1, 1911

Ernest Rutherford found the three types of Radioactivity vy sending a radioactivity through a magnectic field some went to a negative plate, some went to a postivtive plate and others went straight through. The three types are Alpha Particles(+), Beta Particles(-), Gamma rays(neutral)
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Niels Bohr

Jan 1, 1913

Creates a picture of atomic structure that for the most part is still used today.
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picure-http://www.chem1.com/acad/webtext/atoms/atpt-3.html

The Neutron

Jan 1, 1932

James Chadwick discovers the Neutron
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