development of the atomic theory

By balram
  • 400

    Democritus - Democritus atomic model (400 BC)

    Democritus - Democritus atomic model (400 BC)
    Greek philosopher who thought that you can’t continuously cut something in half because you will eventually end up with a atom.
    He Created the word Atom.
  • Period: 400 to

    development of the atomic theory

  • scientist’s

    scientist’s
    Learned that elements combine in certain proportions based the mass to form a compound.

  • John Dalton - Dalton's atomic model

    John Dalton - Dalton's atomic model
    British chemist and school teacher who wanted to know why elements combine in certain proportions.
    He stated that elements combine at a certain proportion because their single elements.
    all substances are made of atoms.
    Atoms of the same element are exactly alike and atoms of different elements are different.
    Atoms join with each other to make new substances.

  • JJ Thomson - plum pudding model

    JJ Thomson - plum pudding model
    He stated that there are smaller particles inside atoms and that atoms can be divided.
    He experimented with a cathode ray tube and discovered that Positive charged plated can bend and attract a beam.
    Electrons = negatively charged particles.
    He knows there are electrons but don't know where the electrons are.
    Guesses its like a pudding.

  • Ernest Rutherford - Rutherford atomic Model

    Ernest Rutherford - Rutherford atomic Model
    Student of Thompson tested out his teachers theory.
    He designed an experiment using a beam of small laser,positively charged particles and aimed it at a sheet of gold.
    Rutherford used thompson's idea that atoms are soft like “blobs” and electrons are evenly distributed.
    nucleus = in the centre of an atom,very dense and positively charged.

    He made a new model that stated that atoms are empty spaced with a tiny nucleus in the middle.

  • Niels Bohr - Modern atomic model

    Niels Bohr - Modern atomic model
    He was a danish scientist that worked with rutherford.
    He Studied of atoms react to light.
    He said that electrons move around the nucleus in define paths.
    There are no paths in his model as the electrons jump from one path to another.
    Atoms have ladders which are said to be said as ladders.

  • Erwin Schrödinger and Werner Heisenberg - Modern atomic model

    Erwin Schrödinger and Werner Heisenberg - Modern atomic model
    They stated the electrons don't move in define tracts.
    There are regions and the regions are called electron clouds.