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400
Democritus Atom model
He discovered that it was indivisable. Also that they had unique forms and shapes in his own state of mind He hypothisized that all matter is composed of tiny parts and bits in which cannect and either make strong, weak, or even taste good. Democritus. "World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. WorldBook Inc., n.d. Web. 23 Feb. 2015. -
Period: to
Atomic theory timespan
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John Dalton
Daltons model added the nucleus and a few electrons just around the nucleus as negitively charged parts. Hia fasination with the weather and atmosphere led to his research into the nature of gasses which in turn became the foundation on which he built his atomic theory. Dalton, John. "World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. WorldBook Inc., n.d. Web. 23 Feb. 2015. -
J.J. Thomson
He discovered a new form of electrons and realized that it was also positively charged so he named the the neutrons. He used cathode rays and said that the ions are negatively as well as positively charged He concluded that all this formed an atom and its parts. Thompson, John. "J. J. Thomson." Wikipedia. Wikimedia Foundation, n.d. Web. 22 Feb. 2015. -
Rutherford
He discovered that the electrons were orbiting the nucleus just as the planets are orbiting the sun. He used some flim a light source and a mirror to find out the complete cycle of the movment of Atoms. Rutherford, Ernest. "World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. WorldBook Inc., n.d. Web. 23 Feb. 2015. -
Bohr Neils
Bohr Neils figured out that the electrons don't orbit the nucleus instead they have an untracable patern He found out by combining Ruthfords discovery with Plancks theory of quanta and found out that they look like a flies flight pattern. Bohr, Neils. "World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. WorldBook Inc., n.d. Web. 23 Feb. 2015. -
Heisenberg and Schrodinger
They both figured out that the electrons were not only unpredictable but that there was also so many that they looked like a cloud but they were moving fast but bouncing Schrodinger, Erwin. "World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. WorldBook Inc., n.d. Web. 23 Feb. 2015.
(Also Heisenberg)
