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He found that if you keep cutting and cutting an object then you would end up with a particle that cannot be cutted called an atom.He also thought that atoms were made of a single material formed into different shape and sizes.
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He said all substances are made of atoms. They cannot be created divided or destroyed. Atoms join with other atoms to make a new substance. Elements combine in certain proportions because they are made up of single atoms.
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Atoms can be divided into smaller parts.He also discovered the Electrons.
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He discoveredthe nucleus. He started with Thomon's idea that and thought that all atoms are the soft "BLOBS" of matter. He also discovered the Protons.
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He studied the way atoms reacted to light. He said that Electrons move in a certain path called energy levels.
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He discovered that the neutrons and protons didn't complete the weight of an atom.