In a laboratory experiment, a heavy parent radionuclide ZAX _Z^A X\,ZAX undergoes a short decay chain. It first emits a single α \alpha\,α particle, and the resulting intermediate nucleus subsequently undergoes two successive β−\beta^-β− emissions to form a stable daughter nucleus YYY.
What term best describes the relationship between the initial parent nucleus ZAX _Z^A X\,ZAX and the final daughter nucleus YYY?
Isobars
Isotopes
Isotones
Nuclear isomers