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*Disagreed with Democritus's model of the atom.
*Felt that there was no smallest part of matter and that different substances were made of earth, fire, air, and water -
First person discover that all matter is made up of invisible particles called atoms.
Created the name "atom" -
Created the Atomic Theory of Matter
Believed atoms of different elements combine in whole ratios to form chemical compunds -
Discovered the electron Created the "Plum Pudding" atomic model
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Created the Quantum Theory which led to the understanding of energy levels in atoms
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Proved J.J. Thompson hypothesis that the electron is 1000x smaller than the atom
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Created the nucleus Believed that only the Nucleus was positive
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Created energy levels in the atom, where only a certain amount of electrons could fit on one energy level of a atom
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Believed that the only way to find the location and energy of an electron in an atom was to calculate its probability of being a certain distance from the nucleus.
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Believed that you can't know the exact velocity and momentum of the electron at the same time, which means you can't know the exact location of the electron
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discovered of wave nature of electrons
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Discovered the neutron Believed that the atom was neutral because the negative electrons and the positive protons cancelled out
