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We suggest that the emergence of a large deformation in the magnesium, Mg,nuclides, especially at the Z = 12, N = 12, should be associated with anoctahedral deformed shape. Within the framework of molecular geometricalsymmetry, we find a possibility that the Z = 12, N = 12 system would form anoctahedral structure consisting of six points of alpha(4He) particles, yieldingthe ground collectivity. With this point of view, we draw the following serialmolecular structures; the Z = 10, N = 10, 20Ne, corresponds to a hexahedral,the Z = 8, N = 8, 16O, does to a tetrahedral, and the Z = 6, N = 6, 12C, doesto a trigonal symmetry. Moreover, the Z = 2, N = 2, 4He(alpha), fits into atetrahedral symmetry with four points of nucleons; two protons and twoneutrons. The enhanced deformation at Z = 12 with N > 20 would be explained bya deformed shape related to an Ethene(Ethylene)-like skeleton with six alphaparticles. The deformation at Z = 10, with N = 10 and 12, can be interpreted asbeing attributed to a hexahedral shape combined by five alpha particles aswell. By noticing that the Z = 4, N = 4 system is unstable to the ground stateunder two-body system with two alpha particles, we conclude that alphaparticles, rather than the eight-protons-neutrons nucleon, govern the 8Bestability. Accordingly, the alpha particle should be a third nucleon, like aproton or a neutron, in a nucleus. We name it the 'Alpharon'. With thispicture, we are able to open a new gate toward understanding of nuclearmany-body systems; nucleon-nucleon interaction, shell structures,nucleon-synthesis, and nuclear matters. We argue that nature favors three-bodysystems; three quarks for a nucleon, three nucleons for a nucleus.

An octahedral deformation with six alpha particles at the Z = 12 system, Mg nuclides: Third nucleons, Alpharons