Formula: Bohr Model Orbital angular momentum Principal quantum number

$$L_{\class{red}{n}} ~=~ \class{red}{n} \, \hbar$$ $$L_{\class{red}{n}} ~=~ \class{red}{n} \, \hbar$$ $$\class{red}{n} ~=~ \frac{L_\class{red}{n}}{\hbar}$$

Rearrange formula

Orbital angular momentum

$$ L_{\class{red}{n}} $$ Unit $$ \mathrm{Js} $$

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

$$ \class{red}{n} $$ 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

$$ \hbar $$ Unit $$ \mathrm{Js} = \frac{ \mathrm{kg} \, \mathrm{m}^2 }{ \mathrm{s} } $$

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} $.