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Simple explanation of the energy states and orbitals in the hydrogen atom. The different states are characterized using quantum numbers and their orbitals are shown, as well as the splitting in the magnetic field and the spin-orbit coupling explained. (This summary was given spontaneously in a second semester lecture to create a basis for the concepts of angular momentum and magnetic moment in atoms.) Correction (minute 6:30): The eigenvalue of L² is l(l+1)*h-bar-square and the eigenvalue of the z-component Lz is m*h-bar. For l=1, the absolute value of L = sqrt(2)*h-bar, whereas for m=1, the absolute value of Lz = 1*h-bar.