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Developed the theory of atoms. He stated they were indivisible particles of matter that make up the entire universe
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The scientist John Dalton rebirthed Democritus's ancient theory of atoms by performing experiments. He stated atoms were spherical balls of matter that were in constant motion
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Discovered the electron and proposed a model of the atom. It looked like a chocolate chip cookie with the dough being the positive charge, and the chocolate chips being the electrons.
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Used his famous gold foil experiment to discover the proton, and theorize that electrons rotate around the nucleus.
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Theorized that electrons rotate on different levels and they can jump from level to level.
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Created the theory of the electron cloud, saying that electrons don't orbit like planets.
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Created the theory of "smashing atoms" by using an electromagnet to accelerate nuclear particles.
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Used artificially accelerated particles to split an atom.
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German egineers Ernst Ruska and Max Knoll used J.J. Thompson's theory of electrons to create a microscope powered by a particle beam of electrons.
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Stated that a gamma ray experiment, done by French scientists to see if they shot alpha particles at light atoms if a penetrating radiation was produced, was untenable. He concluded that a sub-atomic particle with no charge and mass equal to a proton was the cause.
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Using his theory of smashing atoms, Ernest O. Lawrencecreated the calutron, a device that seperated uranium-235 from uranium hexaflouride.
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Using Cockroft and Walton's discovery of splitting and atom, Robert Oppeinheimer and a team of scientists developed the atomic bomb.
