ii. Complete and balance the following nuclear reactions that occur as part of the pp- chain, giving the correct details for the missing entities (each indicated by ? in the equations below): ?+ZBe> gLi L1+11HeHe + ? The energy of stars is provided by nuclear fusion reactions. These reactions obey conservation laws, such as the conservation of total energy. In no more than two sentences, explain what it means for total energy to be conserved in a nuclear fusion reaction. Give two reasons why this nuclear fusion reaction is not allowed: 13F > 130 + e