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Democritus though of the idea of the atoms after wondering what the smallest form of matter was. However, Aristotle strongly disagreed.
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He thought that god existed in atoms.
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He thought that atoms can move and are not stationary.
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John Dalton proposed that atoms have always existed and cannot be created or destroyed, everything is made from atoms, they are the smallest and cannot be broken apart, chemical reactions occur when atoms move and that atoms of the same element are alike because they have the same mass. He also had many more contributions
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He founded radioactivity when he researched uranium and other subtances that were radioactive.
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He discovered the electron and made the plum-pudding model of the atom.
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He found out about the electric charge of electrons.
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He worked on many theories about the atomis number. He also organised many elements on the periodic table.
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His Geiger–Marsden experiment gave us information about the atomic structure, where the atom is a nucleus and electrons orbit around it.
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Neils Bohr discovered the revised structure of the atom.
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He discovered that electrons are similar to both particals and waves. He also supported Einstein.
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He came up with the schrodinger theory.
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He discovered the Heisenberg Uncertainty Principle.
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He discovered the neutrally-charged neutron.