Abstract
A comparison of the transport properties of the elements, compounds, and alloys of the first long period shows many similarities if the electron number is taken as a parameter, although the substances may differ magnetically. This result suggests that their transport band structures are similar. A model for the dependence on electron number of this structure is deduced from the transport properties of some of the nonmagnetic compounds. It is suggested that the model applies to the magnetic substances when they are in their magnetically ordered state.