Atomic Model Timeline

  • Democritus
    430 BCE

    Democritus

    He proposed the reality of atoms and that they created the universe.
  • Plato
    427 BCE

    Plato

    Siad that atoms are ideal geometric forms.
  • The Alchemists
    122 BCE

    The Alchemists

    Created process which allowed for discovery of the atom.
  • Solar System Model

    Solar System Model

    Galileo Galilei created
  • Robert Boyle

    Robert Boyle

    Created an atomic theory that stated all matter was composed of minute particles only different by shape & motion.
  • Antone Lavoisier

    Antone Lavoisier

    Contributed to the atomic model.
  • John Dalton

    John Dalton

    Stated that atoms differ in size and mass.
  • Billiard Ball Model

    Billiard Ball Model

    John Dalton created
  • Amedeo Avogadro

    Amedeo Avogadro

    Stated that atoms have relatively the same size.
  • Dmitri Mandeleev

    Dmitri Mandeleev

    The creator of the periodic table.
  • Pierre and Marie Curie

    Pierre and Marie Curie

    Proved that radioactive particles cause atoms to break down.
  • J.J. Thomphson

    J.J. Thomphson

    Discovered that the electron had a negative charge.
  • Plum Pudding Model

    Plum Pudding Model

    JJ Thomphson created
  • Albert Einstien

    Albert Einstien

    Created an atomic theory that stated all mater is made of atoms.
  • Ernest Rutherford

    Ernest Rutherford

    Discovered how much space an atom takes up.
  • Robert Milikan

    Robert Milikan

    Measured the charge of an electron
  • Niels Bohr

    Niels Bohr

    Developed Bohr atom model which stated that electrons were negatively charged and orbit the nucleus.
  • Henry G.J. Mosley

    Henry G.J. Mosley

    Proved that the atomic number of an element can predict its physical properties.
  • James Chadwich

    James Chadwich

    Stated that all mater is composed of different particles known as atoms and identified the nucleus.
  • Electron Cloud Model

    Electron Cloud Model

    Eruin Schordinger created it.