This study deals with the hypothesis that the nuclear structure determines the atomic shape and properties; this idea led to the construction of a tangible nuclear model, that provides a visual interpretation to nuclear and atomic physics and possibly enables drawing additional conclusions and new insights. The model suggests that the nucleus has, in general, an ellipsoid shape with a cubic system of proton-neutron bonds and that the nuclear and atomic shells correlate with each other. A simplified mass formula was developed to compare between the model and the experimental data; the formula is based on the model's theory and depends only on two parameters, unlike the common formula which is semi-empirical and contains five to six parameters, that are not an inherent part of the theory. the mass formula calculations delivered results, that agree with the experiment; a byproduct of this procxess, that strengthened the assumption of the model, was the estimation of the combined radii of the proton and the neutron.