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major contribution proposed the at matter was formed of small pices that canot be broken down
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Major contriution stared all substances ar made of 4 element 1 fire 2 water 3 air 4 earth
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transformed democritus ideas on atoms into a modern atomic model
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j.j. thompson discoverd electrons in a sires of experements
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major contubution determined the amout and charge of the electron
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major contribution discoverd the radioictive
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he dicoverd orbits
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he dicoverd neutrons
