What happens during radioactive decay?

• A. Atoms release radiation as they transition to a more stable state.
• B. Atoms release radiation as they transition to a less stable state.
• C. Radiation is emitted when atoms gain energy from the surroundings.
• D. Nuclei fuse to form heavier elements releasing energy.

Answer: (A)

During radioactive decay, an unstable nucleus sheds energy by emitting radiation to move toward a more stable configuration. This radiation can be in the form of alpha particles, beta particles, or gamma rays, and the nucleus may become a different element or isotope as a result. The decay is spontaneous and happens because the excess energy or imbalance makes the original state unstable, so releasing it moves the system toward stability. It’s not about gaining energy from the surroundings, nor about nuclei fusing to form heavier elements; those describe different processes.