B. Brown

  • 101

    Democritus - 429 BC

    First person to think of the atom
    Thought atom was a solid sphere
  • 101

    Aristotle - 400 BC

    Everything is made up of 4 elements.
    They are earth, air, fire, and water
  • Isaac Newton

    He believe that there were tiny pieces swimming. (Atoms)
  • John Dalton

    True- All matter is composed of atoms. Different elements have different typees of atoms. Compounds are from atoms of different atoms. Chemical reactions occur when atoms rearranged`
    False- All atoms of same elements are identical. Atoms cannot be made or destoryed.
  • Henri Becquerel

    helped discover radioactivity
  • JJ Thompson

    Proved the existence of electrons
  • Robert Millikan

    meausred change and mass of electron
  • Rutherford

    Proved nucleus was in the middle.
  • Neils Bohr

    Electrons travel in circular orbits.
  • Francis Aston

    discovering of isotopes of non radioactive element
  • Erwin Schrodinger

    discovred formula that calcualtes the odd of electron might be
  • James Chadwick

    discovered the nuetron