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Worked out that atoms, if you keep halfing everything it will eventually become become super small also known as atomos.
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modern atomic theory of different particles can create an element
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Mendeleev created what we now know as the peridic table, He did this by writting down elements onto playing cards with there atomic number and then put them into catagories
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Discovered electrons know as plumb pudding
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Negative nuetrons orbit around the positive protones
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DISCOVERED NUCLEOUS