Integer geometric nuclear modules #2 of 3

The Blender file and .obj file for a cube-4 and other shapes for nucleii. Cube-2, pyramid-5, pyramid-4, dilator-34 and cube-4 are seen. Elements up to tantalum can be assembled from these modules combined with the first group of integer geometric nucleon modules for a static nucleus theory. this is preparing for the essay on promethium, an unstable, cube-4 architype. Looking at the periodic table of nuclear structure, nitrogen, iron, and promethium are the archetypical elements for cube-2, cube-3, and cube-4, respectively. This means the cube-2 has one layer on each face. Cube-3 has two layers covering each face. Cube-4 has three layers armoring each face. The nucleons nestle together for N, Fe, Pm in a kind of perfection of form and function. Nitrogen is for explosives, iron makes magnets, promethium is so radioactive, it is gone with a 2 year to 12 year half life. But Pm is lighter than gold, tungsten, or mercury. The riddle is solved. Cube-4 is unstable and it is in only 4 elements: