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suggested the original atomic theory. Model was an indestructible spheres.
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Introduced Atomic theory into chemistry. His theory was that everything is made of atoms, and that atoms of the same element are identical. He also said that atoms combine in whole numbers. Told us that in chemical reactions, atoms are never changed but can be seperated, combined, or rearanged. His atomic model was a sphere that when added to other spheres increased its weight.
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Formulated the very first rudimentary version of the periodic table based on atomic weight.
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Discovered Protons by studying cathode rays.
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First to discover electrons. He found them by studying cathode ray tubes. His model is a sphere composed of electrons called the "plum pudding model".
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Experimented to find out the electric charge carried by a single electron.
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Created the first model where electrons orbit all around the atom.
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Hypothesized that atoms have their charge in a very small nucleus. He was also the first person to create an artificial nuclear reaction. His model includes a nucleus being orbited by electrons.
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Credited with discovering the neutron while studying under Ernest Rutherford. His atomic model includes protons and neutrons being orbited by electrons.
