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Aristotle says that matter is created by four different elements. Water, Fire, Earth and Air
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Democritus states that Matter is created by invisible particles called "atoms."
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John Dalton states that atoms are small hard spheres. Atoms are invisible. Atoms of the same element are the same. Atoms of different elements are different. Atoms combine in small whole number ratios.
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Discovered radioactivity and all three won nobel prizes in Physics
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Thompson is from England. He discovered the electron Cathode Ray Tube. Used the "Plum Pudding" example.
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Ernest used the Gold Foil Experiment. Discovered the Nucleus and said that is was very small, very dense and in the middle of the atom.
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In Chicago, Robert discovered the charge and mass of an electron.
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Used by Niels Bohr, it structures that electrons orbit the nucleus.
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Niels used the Planetary model which states that electrons orbit the nucleus just like planets orbit the sun.
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In Cambridge, James discovered the neutron.
