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450
Democritus (460 B.C.)
Democritus developed the idea of an atom. He thought all objects could be broken down into " one last piece." He began with the idea the idea that everthing could be broken down into smaller pieces.
http://the-history-of-the-atom.wikispaces.com/Democritus -
450
Aristotle (382-322 B.C.)
Developed the theory that that all matter consisted of four elements: Earth, Air, Water, and Fire. He believed that Democritus's model of the atomic model was incorrect. http://the-history-of-the-atom.wikispaces.com/Aristotle -
Period: 450 to
Dates of Scientists Discoveries
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John Dalton
Dalton's theory stated that "all matter is made of atoms."
Atoms are indivisble and indestructable.He created this theory by observing nuclear power, and chemcial reactions. http://the-history-of-the-atom.wikispaces.com/John+Dalton -
J.J. Thomson
Thomson discovered that electrons surround the nucleus of the atom.
Thompson thought that the atoms had large bodies of positive charge with negative parts dispersed throughout the atom. http://the-history-of-the-atom.wikispaces.com/J.J.+Thomson -
Ernist Rutherford
Rutherford discovered that there are was a large nucleus wiht an overall positive charge. http://the-history-of-the-atom.wikispaces.com/Ernst+Rutherford
http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html -
Niels Bohr
Bohr discovered that protons are in the nucleus and electrons surround it. He tested it by shooting photons at the electrons and proving that the elctrons jump from one ring to another. http://the-history-of-the-atom.wikispaces.com/Niels+Bohr -
Heisenberg and Schrodinger
Erwin Shrodinger showed that electrons are really waves. The "two split expriments", electrons travel in waves if the high point of the waves meet so do the bottom points meet as well. http://the-history-of-the-atom.wikispaces.com/Werner+Heisenberg
http://www.worldbookonline.com/student/article?id=ar495460&st=schrodinger
