A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin. Which would disprove his conclusion?
A) Radium-226 is an unstable isotope of radium.
B) Radon-222 is an unstable isotope of radon.
C) The decay released an alpha particle.
D) The decay released a beta particle and a gamma ray.
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