Fusion reactions occur between what kinds of elements?

A. two very large nuclei

B. two very large uranium isotopes

C. very fast moving electrons

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D. very fast moving neutrons

E. very small atoms

The answer is that fusion reactions occur between very small atoms. Fusion reactions are a kind of nuclear reaction where the nuclei of two atom fuse and form a different atom around one new nucleus, This is only feasible with small atoms. For example, fusion is the nuclear rection that occurs in the Sun, specially between two atoms of H which form one atom of He. This reaction releases a huge amount of energy (nuclear energy).

Fusion reactions are nuclear reactions where the nuclei of two atom fuse and form a different atom around one new nucleous, This is only possible with small atoms. For example, fusion is the nuclear rection where the Sun takes it energy from: two atoms of hydrogen form one atom of He releasing nuclear energy ... So, the answer is the option E. very small atoms.