Americium-241 decays into neptunium-237. which correctly describes this process of radioactive decay?

an unstable nucleus decays into a more stable nucleus.
energy in the nucleus is converted into mass.
the strong nuclear force splits the n

The best and most correct answer among the choices provided by your question is the first choice which is "An unstable nucleus decays into a more stable nucleus."

Radioactive decay (also known as nuclear decay or radioactivity) is the process by which the nucleus of an unstable atom loses energy by emitting radiation, including alpha particles, beta particles, gamma rays, and conversion electrons. A material that spontaneously emits such radiation is considered radioactive.

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The answer is c. valence electrons