humphry davy determined the nature of chemical bonds.
the statements that describe a nuclear reaction are may involve a change in total mass, involve very high-energy changes, and involve changes in nuclides when decay takes place.
there are two kinds of nuclear reactions, that is, fission and fusion. fusion involves the fusion of two light atoms into a heavier atom, while fission involves the splitting of an unstable isotope (with a high mass number) into stable elements of lower mass number, which vary in features from the parent atoms. both the reactions discharge huge concentration of energies in the process.