Notes

The Bohr–Sommerfeld model is an extension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleus, also known as the Sommerfeld model or Bohr–Sommerfeld theory.

The Bohr–Sommerfeld model is an extension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleus, also known as the Sommerfeld model or Bohr–Sommerfeld theory.