Which sequence is an example of radioactive decay? A. The nuclei of two hydrogen atoms fuse together, forming a helium nuclide. B. A calcium atom gives its electrons to two fluorine atoms, forming a formula unit of calcium fluoride. C. A polonium isotope becomes a lead isotope when the polonium nuclide emits two protons and two neutrons. D. Energy from an electric current splits a water molecule into two hydrogen atoms and one oxygen atom.
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