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quantum mechanical model = name

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in 1932 he found the neutron

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in 1896 he discovered radioactivity and won a prize

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in 1871 he found the structure of the atom and made a model of it

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in 1803 he proved the atom was real and rebuilt Democritus theory

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in 1897 he discover electron and put it in atom

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1861 he found thallium

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in 1913 he describes the atom and makes model

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430 b.c the atom theory
it says everything is atoms and between atoms there is nothing atoms cant break  atoms move  there are lots of kinds of atoms