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400
Democritus (B.C.)
he invented the idea of the atom. He discovered this by proposing a question that if you continue to cut a substance down to a smaller size you will reach a size that can no longer be cut down. He said that the atoms varied in size and shape in rellation to one another. Huffman, Carl A. "Democritus." World Book Advanced. World Book, 2015. Web. 20 Feb. 2015 -
Dalton
Theoretically speaking he agreed with Democritus but he did a more in dept investion on the exsistance of the atom.he preformed many expieraments to prove his theory. He said that the atos are relative in size, shape, and mass. Usselman, Melvyn C. "Dalton, John." World Book Advanced. World Book, 2015. Web. 20 Feb. 2015. -
Thomson
He discovered that atoms have specific charges. In particular he found the electron which are the negatively charged part of an atom. He built a cathode-ray tube that allowed him to bypass magnetic feilds thus revealing them. Stuewer, Roger H. "Thomson, Sir Joseph John." World Book Advanced. World Book, 2015. Web. 23 Feb. 2015. -
Ruthford
he discarded the idea of the Plum Pudding model of an atom and concered that the only way the alpha particles could be deflected backwards is if most of the mass in an atom was concentrated in a nucleus. "GaggleTube Video - Discovery of the Nucleus: Rutherford's Gold Foil Experiment." GaggleTube Video - Discovery of the Nucleus: Rutherford's Gold Foil Experiment. N.p., n.d. Web. 23 Feb. 2015. -
Borh
He discovered that electrons travel in a set orbit around the nucleus. "The Development of the Atomic Model." Dot Physics. N.p., n.d. Web. 23 Feb. 2015. -
Heisnberg and Schrodinger
He said that the electrons buzz around the nucleus. The famous Two- split expeirement is another way of looking at the dual wave particle nature of electrons. "GaggleTube Video - The History of Atomic Chemistry: Crash Course Chemistry #37." GaggleTube Video - The History of Atomic Chemistry: Crash Course Chemistry #37. N.p., n.d. Web. 25 Feb. 2015.
