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Democritus named the partices that matter is made up of and he named called them atoms.
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John Dalton proposed an atomic theory with spherical solid masses in motion.
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Chadwick influenced Neutron Radiation because he discovered the neutron. Neutron Raidiation has been used to attempt curing cancer.
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J.J Thompson described the atom as a ball of positive charge containing a number of electrons.
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Ernest Rutherford used his "gold foil" experiment to determine that the nucleus of the atom is very dense and had a positive charge. Thus discovering the protons, Ernest also assumed that the electrons were outside the nucleus of the atom.
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Niels Bohr explained the atomic structure of the atom as "successive orbital shells of electrons." This model is known as the Bohr Planetary model.
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De Broglie and Schrondinger identified the electron cloud model as the probable location of moving electrons.
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In January of 1932, Cockroft produced the first nuclear reaction. He built a linear accelerator which bombarded lithium with protons. This created alpha particles.
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James Chadwick discovered a particle within the nucleous that has a mass simular to that of a proton. He is cretited with discovering the neutron.
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John Dalton's atomic theory was significant in making the atomic bomb. the bomb was dropped on Nagasaki and Hiroshima, Japan to end World War ll
