A curious coincidence is the relationship among number of nucleons of the neon (20, 10 protons + 10 neutrons) and the number of tetrahedron packing of the icosahedra (20).
http://coseinteressanti.altervista.org/IMM_3D/Elementi/10_Ne/20.bmp
http://coseinteressanti.altervista.org/IMM_3D/Elementi/10_Ne/20.c4d (3d)
http://coseinteressanti.altervista.org/IMM_3D/Elementi/base/tetrag_insc.bmp (Reuleaux tetrahedron)

Very good its nice