Atomic Timeline Project

  • The Alchemists
    500 BCE

    The Alchemists

    Discovered a substance that could change lesser metals to silver or gold. (proven false later)
  • Plato
    428 BCE

    Plato

    He invented the theorem of elements.
  • Democritus
    400 BCE

    Democritus

    Discovered that all matter is made of atoms.
  • Robert Boyle

    Robert Boyle

    Invented the theorem of atoms.
  • Antone Lavoisier

    Antone Lavoisier

    Proved conservation of matter.
  • Billiard Ball Model

    Billiard Ball Model

    Solid Sphere
  • John Dalton

    John Dalton

    Discovered that compounds are elements together.
  • Amadeo Avegadro

    Amadeo Avegadro

    Proved that equal volume of gases at the same temperature have the same amount of molecules.
  • James Chadwich

    James Chadwich

    Proved that the Neutron existed.
  • Dmitri Mendeleev

    Dmitri Mendeleev

    Created the Periodic table of elements.
  • JJ Thompson

    JJ Thompson

    Determined charge of mass ratio of electrons.
  • The Curies

    The Curies

    Identified and studied many radioactive elements.
  • Plum Pudding Model

    Plum Pudding Model

    Electrons surrounded by a positive mass.
  • Albert Einstein

    Albert Einstein

    Discovered the Theory of Relativity
  • Robert Millikan

    Robert Millikan

    Did the "Oil Drop" test.
  • Ernest Rutherford

    Ernest Rutherford

    Discovered that the nucleus is positively charged.
  • Neils Bohr

    Neils Bohr

    Discovered that outer orbit of electrons hold more than its inner orbit.
  • Solar System Model

    Solar System Model

    Nucleus orbited by electrons
  • Henry Mosely

    Henry Mosely

    Proton corresponds to atomic number.
  • Erwin Schrodinger

    Erwin Schrodinger

    Mathematically showed how waves describe electrons in atoms.
  • Electron Cloud Model

    Electron Cloud Model

    Nucleus surrounded by a cloud of electrons.
  • Heisenberg

    Heisenberg

    Created the Uncertainty Principle