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No stable nuclides have a neutron number of 19, 21, 35, 39, 45, 61, 89, 115, 123, or >= 127. There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141,

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