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He was doing experiments on chemicals, he seen that it had lumpy particles in it.
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He found out that the electrons are negative and concluded that the particle inside were positive. His model looked like raisins on top of lump pudding.
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He discovered protons and named it that after the greek word for first. They thought something was wrong with the design but still went with it.
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He believed that the electrons orbited not spiral. He made up diferent shapes for the Bohr model, he claimed that the electrons jumped from level of energy.
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He decided to go with the particle waves instead and created that type of model.