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(Acctually in B.C.) He kept cutting something in half until he couldn't any more. Then he theroyieszed that all things are made of little things. And we can't cut them in half. He was the first to think of atoms.
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Found that atoms can be weighted and how to weight them.
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Discovered Radiation and new radioactive elements (atoms). She died from the radiation doses that she was near.
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Found out about Electrons and Isotopes.
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Found info that atoms can release radiation If radioactive.
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Found out that electrons orbit the nucleus.
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Came up with a equation to break apart atom nuclear cores.
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Helped Albert Einstein come up with info about atomic radiation.