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The idea of the island of stability was first proposed by Glenn Seaborg. The hypothesis is that the atomic nucleus is built up in "shells" in a manner similar to the electron shells. That certain numbers of neutrons will completely fill all of the possible quantum states in the nucleus, and therefore mean that there is a lower chance for collision between the protons and neutrons. Since these internal collisions are what cause a nucleus to decay, isotopes with complete neutron shells will be more stable than others.
The magic "number" of neutrons is 184, and the matching proton numbers are 114, 120 and 126 — which would mean that the most stable possible isotopes would be ununquadium-296, unbinilium-304 and unbihexiumunbipentium unbihexium unbiseptium Ubh Full table Predicted properties Name, Symbol, NumberUnbihexium, Ubh, 126 Chemical series Group, Period, Block, 8 , g Appearance unknown Atomic weight Electron configuration e- 's per energy level State of matter pres-310.
The term "particularly stable" is in comparison to the half-lives of slightly lighter or heavier elements; the half-lives of elements in the island of stability are still expected to be measured in fractions of a second, or perhaps measured in days, though some theoretical possibilities include much longer periods.