Which statement best defines radioactivity?

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Multiple Choice

Which statement best defines radioactivity?

Radioactivity is the spontaneous decay of unstable nuclei into a more stable configuration, with the emission of radiation as the nucleus transforms. This decay happens on its own, without needing an outside trigger, and can produce alpha particles, beta particles, or gamma rays as the nucleus moves toward stability. This differs from simply atoms emitting light when they are excited (that’s luminescence, not radioactivity), or from any general interaction where radiation ionizes matter (that describes what radiation can do, not what radioactivity is). Nuclear fusion producing energy is a different process altogether, involving combining nuclei rather than the spontaneous decay of an unstable nucleus.

Radioactivity is the spontaneous decay of unstable nuclei into a more stable configuration, with the emission of radiation as the nucleus transforms. This decay happens on its own, without needing an outside trigger, and can produce alpha particles, beta particles, or gamma rays as the nucleus moves toward stability.

This differs from simply atoms emitting light when they are excited (that’s luminescence, not radioactivity), or from any general interaction where radiation ionizes matter (that describes what radiation can do, not what radioactivity is). Nuclear fusion producing energy is a different process altogether, involving combining nuclei rather than the spontaneous decay of an unstable nucleus.

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