Which pair of nuclei can undergo a fusion reaction?
a) uranium-238 and lead-208
b) hydrogen-2 and hydrogen-3
c) zinc-64 and calcium-44 d) potassium-40 and cadmium-113

The correct answer is B. Fusion only happens between small atoms. Thus, hydrogen-2 and hydrogen-3 can undergo fusion. Fusion reaction happens when two or more nuclei combine or collide to form an element with a higher atomic number. In this process, some of the matter of the fusing nuclei is converted to energy.

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