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John Dalton discovered elements are made up of small particles called atoms. Atoms cannot be created or destroyed. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
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Discovered that atoms contain positive and negativly charged particles.
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Rutherford discovered That atoms have a Nucleus in the middle that contains positively charged particles and the rest of the atom is empty space with electrons scattered throughout.
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Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.
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He built off of Bohr's model of the atom with the Electron Cloud Model. This model depicts the floating motion of the electrons, rather then them having a set path of travel. He determined the probability location of electrons in atoms. According to Schrodinger, electrons stuck in their orbits would set up "standing waves".
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James Chadwick proved the existence of the neutron.
