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They saw that you could get a peice of paper and cut it but eventually you could not cut it anymore.
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Dalton belived that atoms were hard spheres.
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Heisenberg included the cloud in the atoms
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Crooke invented the CRT by putting a negative charge and a positive charge.
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J.J. put magnets on the CRT and discovered electrons (e-) and made up the plum pudding method
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He fired particles into the gold and expected them to go through them, but some of them bounced back and he made the theroy that atoms have a nucleus.
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Bohr said that the negative charge orbited around the nucleus.