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The solid sphere model was the first Atomic Model. It was created by Dalton in the early 19th Century.
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An experiment with cathode ray tubes showed that all Atoms contain tiny negative charged electrons.
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This model showed the atom has tiny, dense, positively charged core called the Nucleus. Which is where all the mass is stored.
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It is a system consisting of a small, dense nucleus surrounded be orbiting electrons.
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This model treats the electrons as matter waves. They have a Intrinsic property called Spin.