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430 BCE
Democritus
This is when Democritus found his Atomic Theory -
John Dalton
When Dalton founded this atomic theory -
Rutherford
Rutherford stated that the alpha particles emitted by radioactive probes to the unseen atomic structure -
JJ Thomson
When Thomson found his atomic theory -
Period: to
Erwin Schrödinger
Developed an Electron Cloud Model for the atomic theory -
Chadwick
Said that an atom was composed of positive and negative charged electrons