The History of the Atom

By emma339
  • 465

    Democritus

    Democritus
    His model was a round sphere with no protons, neutrons, or electrons. His was the first atomic model.

  • Robert Boyle

    Robert Boyle
    He discussed the possibility of atoms existing, but was impeded by the church.

  • Antoine Lavoisier

    He proposed the combustion theory based on sound mass measurements.

  • John Dalton

    John Dalton
    He developed the law of multiple proportions.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    He proposed the periodic law.

  • Eugen Goldstein

    Eugen Goldstein
    He discovered that there is a cathode that travels in the opposite direction of the electrons.

  • J.J. Thompson

    J.J. Thompson
    He discovered corpuscles, now called electrons.

  • Max Planck

    Max Planck
    He found that protons should gain more energy from atoms than they lose.

  • Robert Millikan

    Robert Millikan
    Measured the charge of an electron.

  • Ernest Rutherford

    Ernest Rutherford
    Developed Rutherford Atomic Model.

  • Niels Bohr

    Niels Bohr
    Developed a new model of the atom.

  • James Chadwick

    James Chadwick
    He discovered the neutron.

  • Erwin Schrodinger

    Erwin Schrodinger
    Developed the quantum mechanical model of the atom.