All isotopes that contain an odd number of protons and/or of neutrons (see Isotope) have an intrinsic magnetic moment and angular momentum, in other words a nonzero spin, while all nuclides with even numbers of both have a total spin of zero. The most commonly studied nuclei are H and C, although nuclei from isotopes of many other elements (e.g. H, Li, B, B, N, N, O, F, Na, Si, P, Cl, Cd, Xe, Pt) have been studied by high-field NMR spectroscopy as well.