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Discovered that matter was conserved during chemical reactions.
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Proposed that atoms had a measurable mass. It supported Aristotle's theory of atoms.
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While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
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Used a cathode ray tube to determine the electron's charge to mass ratio which is 1.759X10^8 coulombs/gram.
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Discovered the elements polonium and thorium and also that certain elements were radioactive. The more radioactive, the shorter the half life.
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Theory of quanta or that energy was released in little packets instead of one continuous stream.
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Discovered the electron charge and mass with an oil drop experiment. Supporting J.J. Thomson's theory even more.
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Shot alpha particles at a thin gold film and realized that a few bounced back. Thus proposing the idea of a dense positively charged proton.
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Made the Bohr model and disproved the previouse theory of an atom's composition by placing the atoms on the outside in different layers.
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Used x-ray tubes to find the charge of an atom's nucleus. It was supported by Rutherford's theory of a positively charged nucleus.
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Principle of Indeterminacy you can’t know the position and velocity of something at the same time.
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Proposed the idea that electrons are outside of the atome in a "cloud" formation. Based on Bohr's theory of an atom.
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Found that there were also particles with no charge in the nucleus called neutrons.
