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400 B.C
He created the first atomic model and named it atomus. -
Proposed an atomic theory with spherical solid atoms based on properties of mass that were measurable.
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Proposed electric and magnetic fields filled the void.
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Discovered the charge to mass ratio of of an electron. Also found out that "canal rays" were associated with the proton H +
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Determined the charge and mass of an electron.
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Nucleus was: very dense, very small, and posativley charged. Also assumed that the electrons were located outside of the nucleus.
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Developed an explanation of atomic structure that goes with all of the elements on the perodic table.
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Described atoms by means of formula. Also proposed the Principle of Indeterminancy which states that you can not know both the position and velocity of a particle.
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Viewed electrons as a cloud and introduced "wave mechanics" as a mathematical model of the atom.
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Using alpha particles he discovered a neutral atomic particle. Discovered the neutron.
