Atomic Model by Joel

By whatever29890
  • 500 BCE

    Democritus proposed the existence of atoms.

    Democritus proposed the existence of atoms.
    Due to the lack of technology, this stayed as an idea and could not be tested.

  • Dalton developed his theory of atoms and matter.

    Dalton developed his theory of atoms and matter.
    With careful measurement and chemistry experiments, Dalton was able to support his hypothesis with evidence.

  • JJ Thomson discovered the electron.

    JJ Thomson discovered the electron.
    He had conducted an experiment using electric charges in cathode ray tubes.

  • Rutherford developed the planetary model of the atom.

    Rutherford developed the planetary model of the atom.
    Rutherford done an experiment and used alpha particles fired at thin gold foil and an early type of Geiger counter to measure his results.

  • Bohr developed a model of the atom.

    Bohr developed a model of the atom.
    He has used laws of quantum physics as well as mathematical models to propose his updated model

  • The neutron was discovered by James Chadwick.

    The neutron was discovered by James Chadwick.
    With the use of accurate measurements and kinematics, allowed James Chadwick to prove the existence of a undetected subatomic particle, called a neutron.