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600 BC declared all life came from (everything made of water)
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thought everything was earth, fire, air, and water
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thought everything was made of atoms
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thought atoms moved around and were small
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Atomic Theory
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discovered radioactivity
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discovered electron
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atoms containa nucleus made of protons surrounded by electrons
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determined the charge and mass of electron
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everything was on pathes and couldnt be in between
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discovered and studied isotopes
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used math equiations to describe where electrons will probably be
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discovered evidence of there being a neutron