History of the Peridoic Table

Timeline created by The Men in Suits and Katie
  • 340

    Aristotle

    He believe that atoms were at a constant stand still
  • 440

    Democritus

    Found that there is no way to cut an atom
  • Robert Boyle

    He studied gasses and found that they were groups of particles. These groups created many substances.
  • Antoine Lavoisier

    He created the unison language for science. This helped advancments and limited confusion.
  • John Dalton

    He brought up the theory that the reson elements were clusters of atoms. These atoms could not be destroyed, there were multiple types of elements, and that they created new substances when combined with old substances.
  • J.J. Thomson

    He wrongly thought there were smaller particles in the atom. He did however find that some atoms could be negatively charged.
  • Hantaro Nagoaka

    Though his model was wrong, Nagoaka did discover the rings around atoms
  • Ernest Rutherford

    He proved the plum pudding model wrong with a sheet of gold foil and positively charged particles. He then created a new model.
  • James Chadwick

    Chadwick had discovered the neutron. He saw it as a small particles inside the nucleus that was similar to the proton.
  • John Douglas Cockcroft and Ernest Thomas Sinton Walton

    They built a linear accelerator. And produced alpha particles by infesting lithium with protons. They then split the atom for the first time and later lead to the atomic bomb that ended WW2.
  • James Chadwick

    He theorized the electron cloud. He saw it as the main area of moving particles.
  • Enrico Fermi

    He conducted the first release of energy from the atoms nucleus in a chain reaction.
  • Glenn Seaborg

    He puts together the modern periodic table.
  • Crockroft and Walton

    World War 2 was finished with an atomic bomb that was dropped.
    Crockroft and Walton's idea was used by America to split the atom and create the nucleur bomb.
  • Glenn Seaborg

    He identified lanthanides and actinides (atomic number 92,
    which are usually placed below the periodic table.
  • Quantum Mechanical Model

    The modern day model is one made up of different rings and what the atom consist of (energy levels, protons, and neutrons). It also includes the electron cloud and rings/paths.
  • Neils Bohr

    He discovered that electrons have predetermined pathes and even though they can not move in between the paths they can jump them.