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1920's Erwin Schrödinger was a revolutionary physicist who used Heisenberg’s
uncertainty principle to come up with the atomic model that we still use today

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1910's Niels Bohr agreed with the planetary model of the atom , but also knew that it had a few
flaws. Using his knowledge of energy and
quantum physics he was able to perfect
Rutherford’s model. He was able to answer
why the electrons did not collapse into the
nucleus.

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1910's Ernest Rutherford was not convinced about the model of the atom
proposed by Thomson. He thus set up his now famous Gold Foil
Experiment.

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1890's J.J Thomson was a physicist who is credited for discovering the
electron. He used his research on cathode ray tube technology in this
discovery

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1800's John Dalton was the first to adapt Democritus’ theory into the first modern atomic
model.

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400 BC Democritus was a Greek philosopher who was
the first person to use the term atom