atom theory

  • Democritus
    464 BCE

    Democritus

    round with no electrons, protons or neutrons.
  • John Dalton

    John Dalton

    round with no electrons, protons or neutrons
  • Jj Thomson

    Jj Thomson

    a bunch of electrons surrounded by a soup of positive charge to balance the electrons' negative charges.
  • Ernest Rutherford

    Ernest Rutherford

    the atom has a tiny and heavy nucleus
  • Neils Bohr

    Neils Bohr

    the atom is a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
  • James Chadwick

    James Chadwick

    positively charged nucleus surrounded by negatively charged electrons.