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History of the Atom Theory

By Zoé Morales
  • 460 BCE

    Democritus

    Democritus
  • 460 BCE

    Democritus Atom

    Democritus Atom
    Democritus thought that all things were composed of atoms. He also said they were composed of each element, water, fire, earth, and wind.

  • Dalton

    Dalton

  • Dalton Atom

    Dalton Atom
    Dalton explains the idea of atoms, that all things are made of atoms. He also said that all atoms of an element were the same in mass and property.

  • Thomson

    Thomson

  • Thomson Atom

    Thomson Atom
    Thomson proposed the idea that there were negatively and positively charged particles in an atom called protons and electrons

  • Rutherford

    Rutherford

  • Rutherford Atom

    Rutherford Atom
    Rutherford discovered that atoms have a nucleus that occupies a small part of an atom.

  • Bohr

    Bohr

  • Bohr Atom

    Bohr Atom
    Bhor made the basis for the modern atomic model. He said that electrons orbit around the nucleus.

  • Schrodinger Atom

    Schrodinger Atom
    Schrodinger used math to find the electron in a certain position, this is known as the quantum mechanic atom model.

  • Schrodinger

    Schrodinger

  • Chadwick Atom

    Chadwick Atom
    The Chadwick atom model is the one that we use today. He proposed the idea of neutrons that are particles with no energy charge that when along with protons form the nucleus of an atom.

  • Chadwick

    Chadwick