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What: The theory that everything is composed of "atoms", which are physically, but not geometrically, indivisible

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When: About 400 B.C.

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Where: Abdera

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Where:

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What: a tiny, massive core called the nucleus. The nucleus has a positive charge. Electrons are particles with a negative charge.

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When: 1911

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Where: Manchester

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What: combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.

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When: 1926

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Whe,

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Where: University of Zurich

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What: all matter was composed of atoms

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When: 1803

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Where: College in Manchester

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What: discovered the electron by experimenting with a Crookes, or cathode ray, tube.

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When: 1897

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When:

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Where: Trinity College at Cambridge

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What: a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities.

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When: 1913

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Where: Cambridge