The change in isotopes over time due to the emission of radioactive particles is known as

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timaashorty · Answer

radioactive decay , also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting ionizing radiation. A material that spontaneously emits this kind of radiation—which includes the emission of alpha particles, beta particles, and gamma rays—is considered radioactive. < http://en.wikipedia.org/wiki/Radioactive_decay > It's radioactive decay. Just to make sure, do you have answer choices?