Molecular formula :
nature : The natural atomic number (or proton number) Z in a ~ 82 (except 43,61) will have a stable isotope, to stabilize the area. Z> 82 no stable isotopes. Neutron in a few N ~ 126 (except 19,21,35,39,45,61,71,89,115,123) will have nuclear stability. Nuclear quality in a number of ~ 208 (except, 4-5) will also have nuclear stability.
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