A new nucleus configuration was developed, based on proton or neutron as electric monopole pairs in a thin plate deducted from “the theory of spin vector in motion” developed by us recently. According to the proton and neutron’s configuration proposed, we concluded that the protons and neutrons are bound simply by magnetic force. The protons or neutrons can be bound together in a mode, shoulder-to-shoulder or side by side. The nucleus will be treated as a vertical oval ball with neutrons as the spin axis, with protons filled on different intersection layers with minimum balanced repulsive electric force and repulsive magnetic forces. The radioactivity of isotopic nucleus shall result directly from the unbalanced magnetic force between neutron axis and protons induced by more or less neutron(s) compared to stable isotope. Based on inner structures, spin properties of proton and neutron, we also concluded that there is no “strong force” required to bind quarks or to bind proton(s) and neutron(s) to form a stable nucleus.

proton, neutron, strong force, nucleus configuration, nuclear decay, nuclear reaction