This number determines the energy level of an orbital, and along with spin, angular momentum, and magnetic quantum numbers completely describe an electron in an orbital.
This quantity is equal to L plus one plus the number of radial nodes of the wavefunction. In one model, the square of this quantity is inversely proportional to energy with a constant of thirteen point six. Transitioning between two different values of it gives a frequency proportional to the difference between the reciprocals of the square of two different values of it, via the Rydberg formula. The azimuthal number is bounded by one minus this value, for which different values also generate the Pfund, Balmer, and Lyman series. This number determines the energy level of an orbital, and along with spin, angular momentum, and magnetic quantum numbers completely describe an electron in an orbital. For 10 points, name this quantum number symbolized n.
This quantity is equal to L plus one plus the number of radial nodes of the wavefunction.
 principal quantum number [or n before read; accept energy level until mentioned]