Iron, which takes its English name from Old Anglo-Saxon and its symbol from Latin ferrum, has been identified and used since prehistoric times. It is a very common element, the fourth most abundant in the earth's crust. Additionally, two of the ten most common compounds in the Earth's crust are the two common iron oxides, FeO and Fe2O3.Summary. Elements heavier than helium are produced during the life and death of stars. This review explains when and how the process of nucleosynthesis created elements. High-mass stars fuse elements much more quickly, fuse heavier cores, and die more catastrophically than low-mass stars. Explosions of high mass stars in the form of supernovae. Nucleosynthesis of elements heavier than iron is dominated by neutron capture processes. However, there are proton-rich isotopes between Sr and Hg, which cannot be synthesized by the neutron-induced capture reactions of the s and r processes. 59, abundances are generally factors. 1 − 0. that s and r, nucleosynthesis continues until the nucleus is primarily iron-nickel metal. However, iron has the particular property that any fusion or fission reaction involving the iron core is endothermic, which means that energy is absorbed rather than produced. Therefore, nuclear energy cannot be generated in an iron-rich core. Nucleosynthesis. nucleosynthesis The process by which elements are formed. Modern theories suggest that nucleosynthesis is intimately linked to stages of the life cycle of stars, to stellar evolution and that, starting with hydrogen, heavier elements are created by nuclear fusion of lighter nuclides at temperatures and ,