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and in the case for 50, there are 5 stable nuclides: ⁸⁶Kr, ⁸⁸Sr, ⁸⁹Y, ⁹⁰Zr, and ⁹²Mo, and 1 radioactive primordial nuclide, ⁸⁷Rb). Most odd neutron numbers have at most one stable nuclide (exceptions are 1 (²H and ³He), 5 (⁹Be and ¹⁰B), 7 (¹³C and ¹⁴N), 55 (⁹⁷Mo and ⁹⁹Ru) and 107 (¹⁷⁹Hf and ^180mTa)). However, some even neutron numbers also have only one stable nuclide;

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