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

Option (c) is the correct answer.

Explanation:

A process in which an unstable atomic nucleus loses energy by emitting radiation is known as radioactive decay.

For example, the reaction for radioactive decay of polonium is as follows.

Thus, we can see that polonium decays by emitting an alpha particle.  

Therefore, we can conclude that out of the given options, a polonium isotope becomes a lead isotope when the polonium nuclide emits two protons and two neutrons is an example of radioactive decay.

c. is the answer

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