Why do all atoms follow the same $n$ and $\ell$ quantization conditions as hydrogen?
44624
Why do non-hydrogen atomic orbitals have the same degeneracy structure as hydrogen orbitals?
79994
What exactly means "is a singlet under $SU(N)$"
124703
Where does the $i$ come from in the Schrödinger equation?
87284
What enables protons to give new properties to an atom every time one is added?
143668
Theoretical reasons for charge quantization
116188
Hydrogen radial wave function infinity at $r=0$
82418
Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
46074
How to find hydrogen wave-functions?
58177
Why do lines in atomic spectra have thickness? (Bohr's Model)
61924
Hilbert space in quantum mechanics
8760
Is the harmonic oscillator potential unique in having equally spaced discrete energy levels?
79860
What causes atoms to have their specific colors?
126425
Consistent, complete, and generalized description of the quantum harmonic oscillator
112625
Reduced mass in quantum physics (Hydrogen Atom)
157779
What does the Jacobi identity impose on structure constants?
90250
Two explanations of non-zero atomic radius
70774
Why can't the Schrödinger equation be solved exactly for multi-electron atoms? Does some solution exist even in principle?