scientist that discovered atoms
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Sir James Chadwick
confirmed the existence of the neutron in the nucleus
J.J. Thomson
discovered electrons- cathode ray tube
Lord Rutherford
discovered the nucleus- gold foil experiment
John Dalton
made Democritus' ideas into a scientific theory
Neils Bohr
proposed that electrons move in circular paths or orbits around the nucleus
Democritus
proposed the idea of an atom
gold foil experiment
shot alpha particles through gold foil: some went straight through but others hit something and bounced off course
Aristotle
stated that all substances are made of elements:fire, water, air, and earth
cathode ray tube
used magnets to find that the moving pieces were negative
