nuclide
atomic species characterized by the specific constitution of the nucleus
isotope
nuclides having the same atomic number but different mass numbers
radiogenic nuclide
nuclide produced by radioactive conversion from other nuclide
nuclear isomer
metastable excited state of a nuclide
fertile material
nuclides from which fissile material can be generated
radionuclide
atom that has excess nuclear energy, making it unstable
isotone
nuclides having the same neutron number but different atomic number or mass number
isobar
class of nuclide
primordial nuclide
nuclides predating the Earth's formation (found on Earth)
beta-decay stable isobars
set of nuclides that cannot undergo beta decay