In simple quantum mechanical problems such as the infinite square well, we solve the Time Independent Schrodinger's equation by separation of variable, effectively getting the energy eigenstates of the problem, and then express any general solution as a superposition of the stationary states.
This can also be done for the case of say the Hydrogen atom with one electron and coulomb potential in 3D. However, upon solving for the stationary states, we stumble upon the orbitals of your basic chemistry class.
So in quantum mechanics, the electron is in a superposition of all those orbitals, but in chemistry, an electron only occupies ONE orbital
So my question is why do we not talk about the wavefunctions that may be the linear combination of two or more than two stationary states in atoms or are there conditions in chemistry under which electrons occupy only the stationary states?