N one of two or more nuclides in which the difference between the number of neutrons and the number of protons is the same 等超额中子核素
a nuclide that has emitted an alpha particle, and its decay product, are isodiapheres
N（名词） one of two or more nuclides in which the difference between the number of neutrons and the number of protons is the same 等超额中子核素
a nuclide that has emitted an alpha particle, and its decay product, are isodiapheres