Atom rutherford1

Scientists! Alex Carpenterr

  • 300

    Democritus Discovers the atom.Everything is made up of atoms!

    Discovers the atom.
    Everything is made up of atoms!
  • 300

    Aristotle Disagrees with Democritus

    Changes the theory of an atom!
  • Period: 300 to


  • Daltons Postulates

    1)All Atoms of any one element are exactly alike in all aspects; 2)Atoms of different elements have different properties 3)A compound, as distinguished from an element is composed of a certain definite integral number of atoms of each of the elements present. 4)In the chemical reactions that may occur, none of the atoms are destroyed and no new ones are created.5)When elements react, their atoms sometimes combine in more than one
  • John Newlands

    Publishes his version of the Periodic table
  • Crookes

    Used cathode rays tubes and discovered cathode rays which indicated that different atoms were of the same material.
  • Thomson

    Discovered the electron
  • Mendeleev

    First correct periodic table!
  • Bohr

    Discovers the proton!