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470 BCE
Democritus
His discover kicked off the atom discovery field. Between 470-380 BC this Greek philosopher developed what an atom was, which means invisible in Greek. His experiment was fairly simple, all he did was take a sea shell and break it in half. -
Dalton
He was a chemist and meteorologist. In 1803 his experiment resulted in Dalton’s law of partial pressure. His experiment with gases led to his discovery that the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space. -
JJ Thomson
His experiment with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Then his second experiment was the plum pudding model which had negatively charged electrons within positivity charged “soup”. -
Rutherford
He conducted the Geiger-marsden experiments. He was the one that conducted the experiment with alpha partials. He sent alpha partials through gold foil, some bounced off and some went through. It was founded that a small percentage of partials were deflected and a majority passed through. -
Bohr
His experiment was the first to discover that electrons travel in separate orbits around the nucleus and that a number of electrons are an in outer orbit determines the property of an element. His experiment resulted in the Bohr model as a small, positively changed nucleus surrounded by orbiting electrons.
