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Atom timeline

By Jacobshultz1
  • 430 BCE

    430 BC Democritus

    430 BC Democritus
    Democritus proposed the first atom theory. He called them atomos
  • 430 BCE

    Leucippus denied Democritus theory

    Leucippus denied Democritus theory
    A more well know philosopher Leucippus said that Democritus theory wasn’t correct and that things were actually made of earth water air and fire.

  • John Dalton

    John Dalton
    He proposed the atomic theory where everything is made of smaller things.

  • Earnest Rutherford

    Earnest Rutherford
    He started the gold foil experiment with alpha particles which he discovered. The thought was that a atom was a solid thing but they found out it was mostly empty space. Also something in the middle cause the positive alpha particles to be repealed which is now called the nucleus.

  • Neil Bohr

    Neil Bohr
    He came up with the first picture of what a atom could look like which was called the orbital model.

  • Erwin Schrödinger

    Erwin Schrödinger
    He came up with the wave model of the atom.

  • James Chadwick

    James Chadwick
    Using alpha particles he discovered a neutral atomic particle with a mass close to a proton. This was the neutron.