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450
Democritus
"Democritus - Biography." Democritus. N.p., n.d. Web. 23 Feb. 2014.Democritus is and forever will be one of the few people who discovered something by discovering absolutely nothing! While he never actually had found the Atom as we know it, he did recognize the fact that objects, (i.e. matter) are made up of smaller parts invisible to the human eye. As stated before he did little to no research to reach such a conclusion, and therefore made his discovery of sorts purely through brain power. Sadly however, he had no true atomic model, but had an idea of it. -
500
Aristotle
"Aristotle." The-History-of-the-Atom -. N.p., n.d. Web. 20 Feb. 2014.
The atom as we know today, had been in some way introduced by Democritus who had said that all matter is made up of smaller parts invisible to the human eye. However aristotle reasoned that all mater was made of "The Four Elements" Earth, Air, Fire, and Water. He had no proof for his theory and no atomic model either. -
Dalton
"John Dalton." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 22 Feb. 2014.
John Dalton developed his atomic theory around the year 1803. He believed that atoms were the smallest feasible unit of matter and that it was indestructible. He made his discoveries through the research of gases and his model appeared as a marble. -
Thomson
"Joseph John Thomson." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 20 Feb. 2014.
In the year 1897 J.J. Thomson announced his long in the works theory of the atom. New and never seen before, was his idea of electrons. Using cathode-ray tubes he discovered a sphere of positive force with electrons around it. His model was called the plum. -
Rutherford
"Rutherford - Atomic Theory." Rutherford - Atomic Theory. N.p., n.d. Web. 23 Feb. 2014.
Ernest Rutherford discovered the nucleus of atoms, which like Thomson was a huge advancement that hadnt yet been discussed. He believed taht that atom had a positive nucleus with negative electrons rotating around it. He disovered this by scattering alpha particles from gold foil using radiation, and his model was called the Planetary System. -
Bohr
Palermo, Elizabeth. "Niels Bohr: Biography & Atomic Theory." LiveScience. TechMedia Network, 14 May 2013. Web. 21 Feb. 2014.
Bohr fed off of Rutherford's discovery of electrons, by proposing the idea that electrons orbited around the nucleus at set distances. He made his disovery by observations of the atomic emissions spectrum of the hydrogen atom, and his model was dubbed the Bohr Model. -
Heisenburg and Schrodinger
Multiple Bibliographys, Click Here.
Heisenburg developed the uncertainty principle, which stated that you can never measure the current position of an atoms particles because they are always moving, and can never stop. Schrodinger fed off of this and developed our modern day quantum mechanics. He stated that his equation was the reason electrons moce when in an atom. He tried to view electrons, but no avail could not, and still can not today.
