Nuclear magnetic moment is partly predicted by this simple version of the shell model. The magnetic moment is calculated through "j", "ℓ" and "s" of the "last" nucleon, but nuclei are not in states of well defined "ℓ" and "s". Furthermore, for odd-odd nuclei, one has to consider the two "last" nucleons, as in deuterium. Therefore, one gets several possible answers for the nuclear magnetic moment, one for each possible combined "ℓ" and "s" state, and the real state of the nucleus is a superposition of them. Thus the real (measured) nuclear magnetic moment is somewhere in between the possible answers.