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400 BCE
Democritus Proposes the Idea of the Atom
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John Dalton Creates Atomic Theory
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J.J. Thomson Discovers the Electron
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Marie Curie Discovers Radioactive Elements Radium and Polonium
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Ernest Rutherford discovers Radioactive Half-Life
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Niels Bohr Creates the Bohr Atomic Model
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Erwin Schrödinger Makes Wave Equation
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James Chadwick Discovers Neutrons in Atoms