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Where does radioactivity come from? A.The nuclei of unstable isotopes B. Physical changes in atoms C. Chemical reactions D. The breaking of chemical bonds
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Where does radioactivity come from?

A.The nuclei of unstable isotopes

B. Physical changes in atoms

C. Chemical reactions

D. The breaking of chemical bonds

User Ajayel
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1 Answer

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A.) the nuclei of unstable isotopes.
User Kamilah
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