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He discovered the exsistence of invisible atoms charectorized only by quantive properties; size, shape, and motion.
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Atoms of a given element posses unique charectoristics and weight and 3 types of atoms exist. Simple elements, compound (simple molocules), and complex.
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He discovered cathode rays were negatively charged particles which he called "corpuscles". He claimed these were things from which atoms were built up. They had a mass of about 100 times smaller than a hydrogen atom.
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Thompson cocluded that particles were a universal componet of matter. He also discovered that cathode rays could be deflected by an electric field.
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He thought that all the alpha particles with a charge +2e were brought together into a little ball by Columbus repulsive force, which has the charge +Ze.
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He discovered that electrons travel only in certain orbits and that only in a discrete set of stable states. This explained the atomic structure of the atom as "successive orbital shells of electrons",
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Francis Aston discovered that for different elements the atomic mass isn't the same for all the atoms of the element. The experiment led to the making of the catscans.
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He identified the electron cloud model as the probable location of moving electrons.
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He discovered a particle within the nucleus that has a mass similar to that of a proton. Thus, he is credited with discovering the nuetron.
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Split the atom.
Split the nucleus at the heart of the atom. -
Bomb was dropped on Japan to end World War Two.
