multiple choice question\nunstable isotopes are called _______.\nions\nradioisotopes\nneutrons\nisomers

Brief Explanations:

Unstable isotopes spontaneously decay and emit radiation. This characteristic defines them as radioisotopes. Ions are charged atoms or molecules, neutrons are sub - atomic particles, and isomers are different structural forms of a compound with the same molecular formula.

Answer:

B. radioisotopes