Where do the four atomic quantum numbers come from?
Niels Bohr in 1913 was the first person to introduce a quantum number.
The Bohr model used only a single quantum number
In 1925, Erwin Schrödinger developed his three-dimensional quantum mechanical model of the atom.
He introduced three quantum numbers:
#n#, the principal quantum number, which specified the energy and size of the orbital. #l#, the azimuthal quantum number, which specified the shape of the orbital #m_l#, the magnetic quantum number, which specified the orientation of the orbital in a magnetic field.
Also in 1925, George Uhlenbeck and Samuel Goudsmit introduced a fourth quantum number, called the spin quantum number
And that’s where our four quantum numbers come from.