A species of atom characterized by the constitution of its nucleus, in particular by the number of protons and neutrons. Thus, Co-59 and Co-60 are both isotopes of cobalt and are each nuclides. Co-60 is a radionuclide since it undergoes radioactive decay.
An artificially produced isotope that emits radioactive waves and may be used in radiotherapy for the treatment of tumors.
An atomic nucleus identified by its atomic number, mass, and energy state.
An atomic species characterized by a solitary atomic number and a singular mass number.