Atomic theory

By ava3a
  • Period: 800 BCE to

    Atomic theory

  • 460 BCE

    Empedocles and the Aristoleian elements

  • 440 BCE

    Leucippus and atomism

  • 420 BCE

    Democritus and the atom

  • 360 BCE

    Aristotle and the Aristoleian elements

  • Isaac Newton begins to understand that atoms are always in motion.

  • Robert Boyle publishes Boyle's Law.

  • Antoine Lavoisier discovers the law of conservation of mass.

  • Joseph Proust publishes Proust's Law.

  • John Dalton publishes his atomic theory.

  • Jons Jacob Berzelius creates the nomenclature of elements and establishes the atomic weight of elements.

  • Amedeo Avogadro publishes his molecular hypothesis.

  • William Prout publishes his hypothesis on atomic weight.

  • Michael Faraday publishes Faraday's laws.

  • Robert Brown discovers the first accepted evidence that atoms exist.

  • Julius Plucker discovers first real evidence of electron.

  • Stanislao Cannizzaro publishes "Sunto de un corso di filosofia chimica”.

  • Sir William Crookes discovers thallium and creates the Crookes radiometer.

  • John Newlands publishes his law of octaves.

  • Dmitri Mendeleev creates his periodic table of the elements.

  • Sir William Crookes discovers the atomic weight of thallium.

  • G.J. Stoney first uses the term "electron".

  • Eugen Goldstein discovers the proton.

  • W.K. Roentgen discovers x-rays.

  • Jean Baptiste Perrin proves that cathode rays carry negative charges and are particles.

  • J.J. Thomson discovers the electron.

  • Henri Becquerel works on uranium and discovers Becquerel Rays.

  • Lord Kelvin creates the plum pudding model of the atom.

  • Marie and Pierre Curie discover polonium and curium.

  • Max Planck creates quantum theory and Planck's constant.

  • Hantaro Nagaoka publishes his Saturnian system model of the atom.

  • Albert Einstein proves the existence of atoms.

  • Hans Geiger creates the geiger counter.

  • Geiger, Marsden, and Rutherford conduct the gold foil experiments.

    1908-1913

  • Jean Baptiste Perrin confirms the atomic nature of matter.

  • Robert Millikan discovers the charge of an electron.

  • Ernest Rutherford publishes his nucleus theory.

  • Antonius van den Broek discovers alphon particles.

  • Niels Bohr creates his model of the atom.

  • Henry Moseley discovers the atomic number.

  • Frederick Soddy discovers that not all radioactive preparations are unique elements.

    This is when he coined the term isotope.

  • Henry Moseley publishes Moseley's law.

  • Francis Aston creates the mass spectograph to map isotopes.

  • Louis de Broglie publishes the de Broglie wavelength.

  • Erwin Schrodinger formulates his wave equation and creates the quantum mechanical model.

  • Werner Heisenberg discovers and publishes the uncertainty principle.

  • James Chadwick proves the existence of neutrons.

  • Enrico Fermi creates the first nuclear chain reaction.

  • Frederic and Irene Joilot-Curie create the first artifical radioactive isotopes.

  • Otto Hahn, Lise Meitner, and Fritz Strassman discover nuclear fission.

  • Enrico Fermi helps to create the first nuclear reactor.

  • Glenn Seaborg discovers plutonium-239.

  • Maria Goeppert Mayer and Hans Jensen create the nuclear shell model.

  • Murray Gell-Man and George Zweig discover quarks.

  • Chernobyl Nuclear Powerplant meltsdown.

  • Fukushima Daiichi nuclear disaster occurs.