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1. N any of the numbers 2, 8, 20, 28, 50, 82, and 126. Nuclides with these numbers of nucleons appear to have greater stability than other nuclides 幻数; 2、8、20、28、50、82和126中的任意一个，具有此类核子数的核素和其他核子相比显得更为稳定[physics]