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401 BCE
Democritus discovers the atom
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399 BCE
World Event: Cyrus the Younger is killed in Persia
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World Event: USA purchases a bunch of land from France in the Louisiana Purchase
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John Dalton's "Marble" Model
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Michael Faraday discovered that atoms have an electrical component.
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Eugen Goldstein discovers the existence of the positively charged particle.
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JJ Thompson discovers the negatively charged particle, or the electron
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World Event: William McKinley assassination
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Ernest Rutherford creates "Jimmy Neutron" model of the atom
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Robert Millikan discovers the charge of an individual electron
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Neils Bohr creates the "Solar System" model of the atom.
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World Event: Austria-Hungary declares war on Serbia, beginning World War I.
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Erwin Schrodinger creates "electron cloud" model of the atom
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Werner Heisenberg discovers that a particle's position and momentum cannot both be known exactly.
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World Event: US Stock Market Crash
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James Chadwick creates "electron cloud" model of the atom with neutrons added.
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World Event: The Hindenburg Disaster