Hi guys, I have been reading about nuclear fusion and I have some doubts that I did not find the answer. I understand that the reactants are in a more energetic state than the products when the energy release occurs, however: *What triggers the release of energy? *Where does the released energy come from? *How is it released from the atom? Another question, but related to the theme: *What defines the stability of a nucleus or particles? Thank you in advance.