Alternating Nucleon Model structures of stable nuclides from 2H to 72Ge

The attached interactive HTML file contains rotatable geometric visualizations of 81 stable ground-state isotopes from ²H through ⁷²Ge. The Alternating Nucleon Model (ANM) assigns explicit three-dimensional coordinates to every proton and neutron, optimizing proton–neutron pairs within unique cylindrical lattice structures. Interactive 3D visualizations display alternating nucleon positions and inter-nucleon connections within strong-force range. These structures derive from two empirical length scales: the proton charge radius (0.8414 fm) and the inter-ring separation (0.9616 fm), combined with prolate spheroid nucleon geometry inferred from the N→Δ(1232) quadrupole transition. Structural complexity condenses to a single geometric parameter: the average nearest-neighbour coordination number (𝒞AN), which quantifies mean nearest-nucleon interactions for each nuclide. Nuclide assembly constrained by experimental charge radii (R² = 0.97-0.98, RMSE = 0.107-0.118 fm) yielding binding energy per nucleon (R² = 0.993, RMSE = 0.104 MeV, n = 79, ⁴He excluded) – SEMF Coulomb term via pairwise quark-charge summation (R² = 0.98, 97.4% stepwise concordance). Steric constraints of incomplete lattice rings predict the next stable isotope in 26 of 33 cases, while structural symmetry identifies the eight most cosmically abundant isotopes. These results demonstrate that a geometric nuclear model is not only visualizable but predictive across three orders of magnitude in energy scale.