How do the principal quantum numbers of the quantum-mechanical model relate to the Bohr model of the atom?

These are all associated with particular physical properties. n, the principal quantum number, is associated with the total energy, the same way it is in the Bohr model, the orbital quantum number, is connected to the total angular momentum of the electron.

Explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.