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450
Aristotle
He disagreed with Democritus because in Greece their theories were based more on thought than the application of science. He did not make a model of the atom because he believed the atom did not exist.
"History of the Atomic Model." Timetoast. N.p., n.d. Web. 25 Feb. 2014. -
450
Democritus
He developed the theory of the atom. To make his discovery he thought about what would happen if a substance was cut in half repeatedly. He came to the conclusion that the finish product would be a indestructible roud ball.
"History of the Atomic Model." Timetoast. N.p., n.d. Web. 25 Feb. 2014. "History of the Atomic Model." Timetoast. N.p., n.d. Web. 25 Feb. 2014. -
Dalton
John Dalton confirmed the idea of atoms by performing experiments with various chemicals. He did not know about the structure of the atom.
"History of Atoms." History of Atoms. N.p., n.d. Web. 24 Feb. 2014. -
Thomson
J.J. Thomson discovered the electron and knew that electrons had a negative charge. His model of the atom looked like raisins in a clump of pudding, recieving the name "Raisins in the Pudding."
"History of Atoms." History of Atoms. N.p., n.d. Web. 24 Feb. 2014. -
Rutherford
Rutherford felt that Thomson's model of the atom was incorrect. He experimented with alpha rays by shooting them at gold foil. By doing this he discovered the the nucleus and also that the nucleus is positive. His new model of the atom had the nucleus in the middleand neutrons surrounded the nucleus.
Http://cronodon.com/Atomic/AtomTech2.html "History of Atoms." History of Atoms. N.p., n.d. Web. 24 Feb. 2014. -
Bohr
Bohr said that electrons could jump from energy rings. The atom rings radiate energy when an electron jumps from a higher level to a lower level but the atom absorbs energy when the electron jumps from a lower level to a higher level. To discover this he had to take a new aproach to science and make new rules. His model of the atom showed that electrons travel in orbits that can be eliptical and tilted due to a magnetic field.
"History of Atoms." History of Atoms. N.p., n.d. Web. 24 Feb. 2014. -
Heisenberg and Schrodinger
Schrodinger's model atom said that vibrations traveled in circles. Heisenberg's uncertainty princples says that we can't know the postion and speed of a particle at the same time.
"History of Atoms." History of Atoms. N.p., n.d. Web. 24 Feb. 2014.
Http://cronodon.com/Atomic/AtomTech2.html
