# Formula Bohr Model Orbital angular momentum    Principal quantum number

## Orbital angular momentum

Unit
Orbital angular momentum of the electron in the $$\class{red}{n}$$-th state. It can be - according to the Bohr model - only a multiple of the reduced Planck's constant $$\hbar$$, so that the electron orbits the nucleus in a stable orbit.

## Principal quantum number

Unit
Principal quantum number is a natural number $$\class{red}{n} ~\in~ \{1,2,3...\}$$ and quantizes angular momentum in the Bohr model as a multiple of $$\hbar$$.

## Reduced Planck's constant

Unit
Reduced Planck's constant is a physical constant (of quantum mechanics) and has the value: $$\hbar ~=~ \frac{h}{2\pi} ~=~ 1.054 \,\cdot\, 10^{-34} \, \text{Js}$$.