Atomic Model timeline

By 26AReddy
  • 500 BCE

    The Alchemists

    The Alchemists
    The Alchemists were a group of people discovered that all metal contained mercury and sulfur. They also discovered that metal can turn into gold.
  • 460 BCE

    Democritus

    Democritus
    Democritus discovered that atoms make up all material things.
  • 428 BCE

    Plato

    Plato
    Plato discovered that the ideal geometric forms serve as atoms.

  • Robert Boyle

    Robert Boyle
    Robert Boyle discovered that substances cannot be broken down without breaking something else.

  • Antone Lavoiser

    Antone Lavoiser
    Antone Lavoiser discovered that oxygen was the key substance in combustion.

  • Billiard Ball Model

    Billiard Ball Model
    John Dalton created this model by using billiard balls as atoms. He wanted to show that the atoms were small.

  • John Dalton

    John Dalton
    John Dalton discovered that all matter has atoms.

  • Amedeo Avogadro

    Amedeo Avogadro
    Amadeo Avogadro discovered that atoms could exist in the form of molecules.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Dmitri Mendeleev discovered the periodic classification of elements.

  • Neils Bohr

    Neils Bohr
    Neils Bohr discovered the theory of atomic structure:which states that all atoms look different.

  • Pierre and Marie Curie

    Pierre and Marie Curie
    Pierre proved the existence of positively, neutral, and negatively charged ions. Marie discovered the radioactive elements polonium and radium.

  • JJ Thompson

    JJ Thompson
    JJ Thompson discovered the electron.

  • Plum Pudding Model

    Plum Pudding Model
    The Plum Pudding Model was discovered by JJ Thompson and showed electrons surrounded by a volume of positive charge.

  • Albert Einstein

    Albert Einstein
    Albert Einstein proved the existence of atoms.

  • Robert Millikan

    Robert Millikan
    Robert Millikan discovered the value of electron charge.

  • Solar System Model

    Solar System Model
    The Solar System Model was discovered by Neils Bohr and showed electrons orbiting the nucleus.

  • Henry G.J. Mosely

    Henry G.J. Mosely
    Henry Mosely discovered the basis of the periodic table.

  • Ernest Rutherford

    Ernest Rutherford
    Ernest Rutherford discovered that atoms consist of mostly empty space. He discovered that the mass is mostly in the nucleus.

  • Erwin Schrodinger

    Erwin Schrodinger
    Erwin Schrodinger calculated energy levels of electrons.

  • Electron Cloud Model

    Electron Cloud Model
    The Electron Cloud Model was discovered by Erwin Shrodinger and shows electrons surrounding the nucleus. It also shows that it is hard to find the exact location of the electron.

  • Werner Heinsberg

    Werner Heinsberg
    Werner Heinsberg discovered the theory that states that the exact position of a particle cannot be found.

  • James Chadwich

    James Chadwich
    James Chadwich discovered the neutron.