20. Radioactivity is due to A.Unstable nucleus B.Stable nucleus C.Stable electronic configuration D.Stable electronic configuration
Option A Solution: Radioactivity is the release of energy and matter due to a change in the nucleus of an atom. Radioisotopes are isotopes that are unstable and release radiation. All isotopes are not radioisotopes. Transmutation occurs when a radioactive element attempts to become stabilized and transforms into a new element.
unstable nucleus
