1st Bohr's condition
In atomic physics, the Rutherford–Bohr model or Bohr model, depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
Electrons can only gain and lose energy by jumping from one allowed orbit to another, absorbing or emitting electromagnetic radiation with a frequency determined by the energy difference of the levels.
The angular momentum of the motion of the electron about the nucleus is restricted to be an integer multiple of a fixed unit.
|L||Angular momentum (J*s)|
|n||Principal quantum number (dimensionless)|