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John Dalton
The theory of atomism. Showed that various different items could all be broken down, splitting molecules into atoms of hydrogen, oxygen, and carbon. Made the billiard ball model. -
JJ Thomson
Cathode Ray Tube (CRT) Experiment. Showed that all atoms contained some form of negatively charged things he named, “Electrons”. Made Plum Pudding Model. -
Ernest Rutherford
Gold Foil Experiment; Observations: Most particles pass through, some are deflected in different directions, and very few bounce back. Made Rutherford Atomic Model. -
Niels Bohr
Hydrogen Atom and how the electrons travel certain distances or axis, from the nucleus. These were known as shells. Made Planetary Model. -
James Chadwick
The beryllium bombardment experiments. Contributed Neutrons to Quantum Model and allowed for the discovery of Isotopes in atoms.