History of the Atomic Model

By ChubbyNubs98
  • 460

    Democritus

    Democritus
    -Based his theory on logic at the time
    -First man to come up with an atomic theory
    -Thought there was an infinite amount of atoms that were always moving and were indivisible. Also thought that they're invisible but solid.

  • Antoine Lavoisier

    Antoine Lavoisier
    -Came up with the Law of Conservation of Mass
    -The basis of the law is that mass cannot be created or destroyed, only rearranged and altered.

  • John Dalton

    John Dalton
    -All matter is made up of small indivisible particles called atoms.
    -Atoms of different elements have different proportions.
    -Cannot be subdivided, created, or destroyed.
    -Combine to form chemical compounds.
    -In chemical reactions, atmos are rearranged.

  • Julius Plucker

    Julius Plucker
    -Conducted the Cathode Ray Tube Experiment
    -Unintentionaly discovered electrons
    -Coined them "Cathode Rays"

  • Dmitrii Mendeleev

    Dmitrii Mendeleev
    -Created the first periodic table
    -Organized it by increasing atomic massmof elements
    -This is the Atomic Theory

  • Max Planck

    Max Planck
    -Founder of the Quantum Theory
    -Quantum theory helps explain sub-atomic particles and atoms in general.

  • J. J. Thompson

    J. J. Thompson
    -Credited with coining the term, electron.
    -Created the "Plum Pudding" model
    -Electrons surrounded by an area of positive charge.

  • Hantaro Nagaoka

    Hantaro Nagaoka
    -Came up an early model of what an atom could look like.
    -The "Santarium Model"
    -Incorrect model based on the rings of Saturn.

  • Ernest Rutherford

    Ernest Rutherford
    -Did the "Gold Foil' experiment.
    -By shining rays through a think gold foil, Rutherford discovered the nucleus in atoms.
    -Led him to create the Rutherford model which consisted on a positively charged nucleus surrounded by electrons.

  • Niels Bohr

    Niels Bohr
    -Created the Bohr model.
    -A positively charged mucleus surrounded by elcectrons like the Rutherford model.
    -The difference is that he theorized that the electrons orbited the nucleus like the solar system.

  • Erwin Schrodinger

    Erwin Schrodinger
    -Discovered that electrons are located in a electronic cloud surrounding the nucleus called the Quantum mechanical Model.
    -Used statistics and geometry to come up with wave mechanics.
    -Also used the "old quantum theory"

  • James Chadwick

    James Chadwick
    -Used Hugh Webster's findings as evidence for his theory of a neutron.
    -Credited for discovering the neutron, a sub-atomic particle with no charge
    -Protons and neutrons in the center surrounded by electrons.