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The Bohr model is a relatively primitive model of the hydrogen atom, compared to the valence shell model. As a theory, it can be derived as a first-order approximation of the hydrogen atom using the broader and much more accurate quantum mechanics and thus may be considered to be an obsolete scientific theory.
The theory would have correctly explained the Zeeman effect, except for the issue of electron spin. Sommerfeld's model was much closer to the modern quantum mechanical picture than Bohr's. In the 1950s Joseph Keller updated Bohr–Sommerfeld quantization using Einstein's interpretation of 1917, [6] now known as Einstein–Brillouin–Keller method.
Niels Henrik David Bohr (7 October 1885 – 18 November 1962) was a Danish theoretical physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.
This model, which became known as the Bohr–Sommerfeld model, allowed the orbits of the electron to be ellipses instead of circles, and introduced the concept of quantum degeneracy. The theory would have correctly explained the Zeeman effect, except for the issue of electron spin. Sommerfeld's model was much closer to the modern quantum ...
Einstein had proposed the photon in 1905, and Arthur Compton provided experiment in 1922 with his Compton effect, but Bohr refused to believe the photon existed even then. Bohr continued to dispute the existence of the quantum of light (photon) and along with Hans Kramers and John C. Slater elaborated the BKS theory in 1924.
According to Bohr's complementarity principle, light is neither a wave nor a stream of particles. A particular experiment can demonstrate particle behavior (passing through a definite slit) or wave behavior (interference), but not both at the same time. [72] The same experiment has been performed for light, electrons, atoms, and molecules.
Bohr, meanwhile, defended the idea that quantum systems can only have their own reality defined after the scientist has set up the experimental design. “God does not play dice,” Einstein said.
Niels Bohr interpreted quantum experiments like the double-slit experiment using the concept of complementarity. [84] In Bohr's view quantum systems are not classical, but measurements can only give classical results.