atomic theory assignment 1

Timeline created by 19fielde
  • dalton atomic theory

    dalton atomic theory
    Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
  • thompsons atomic theory

    thompsons atomic theory
    Thomson interpreted the deflection of the rays by electrically charged plates and magnets as evidence of &quotbodies much smaller than atoms&quot that he calculated as having a very large value for the charge-to-mass ratio.
  • rutherfords atomic theory

    rutherfords atomic theory
    Rutherford was forced to discard the Plum Pudding model and reasoned that the only way the alpha particles could be deflected backwards was if most of the mass in an atom was concentrated in a nucleus. He thus developed the planetary model of the atom which put all the protons in the nucleus and the electrons orbited around the nucleus like planets around the sun.
  • bohr's atomic theory

    bohr's atomic theory
    Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.
  • Erwin Schrodinger's atomic theory

    Erwin Schrodinger's atomic theory
    Erwin Schrödinger, an Austrian physicist, took the Bohr atom model one step further. Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.
  • Werner Heisenberg's atomic theory

    Werner Heisenberg's atomic theory
    1932-won the Nobel Prize in physics for establishing the field of quantum mechanics. Heisenberg suggested that any theory of the atom must be based on observable phenomenon, such as the spectral lines emitted by atoms, and not pictorial constructs such as Bohr's nuclear model of the atom.