21. Where \ mathit l is the angular momentum quantum number . 22. In X-ray notation, the principal quantum number is given a letter associated with it. 23. Several techniques for symmetry restoration by projecting on good quantum numbers have been developed. 24. :You can tell the principle and azimuthal quantum numbers by looking at the wavefunction. 25. The valence of a transition metal center can be described by standard quantum numbers . 26. In particle physics, the charge number is a ( derived ) flavor quantum number . 27. The quantum number can be interpreted as the number of photons in the mode. 28. The energy levels in the hydrogen atom depend only on the principal quantum number . 29. The triplet state has total spin quantum number S = 1 and is paramagnetic. 30. As with the principal quantum number , higher numbers are associated with higher potential energy.