Stylised atom with three bohr model orbits and stylised nucleus

History of Atom

By gknasinski
  • 400 BCE

    Democritus

    Democritus
    Democritus made the discovery of the atom and found out that everything is made up of them.

  • John Dalton

    John Dalton
    John Dalton made the theory that is still being used today in modern theory.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Arranged all the elements into a periodic table of elements. He did it when people noticed relations with masses.

  • Eugene Goldstein

    Eugene Goldstein
    Goldstein made the discovery that there was a positive charge in the atom and it is called the proton.

  • J.J. Thompson

    J.J. Thompson
    Thompson made the discovery of the negativly charged electron and also made a plum pudding model.

  • Ernest Rutherford

    Ernest Rutherford
    Rutherford made the discovery that the atom was mainly made up of empty space. He also found out that it has a nucleus.

  • Robert Millikan

    Robert Millikan
    Had the oil drop experiment which helped show us the charge of the electron.

  • Werner Heisenberg

    Werner Heisenberg
    Helped make the equations for the quantum mechanics.

  • Erwin Schrodinger

    Erwin Schrodinger
    Made the model of the atom called the quantum mechanical model. He made it using math equations.

  • James Chadwick

    James Chadwick
    Chadwick found out that there was a neutral charge that was called the neutron located in the atom.