One explanation for the existence of elements heavier than iron is the rapid neutron-capture process (r-process). In the r-process proposed to occur in supernovae, many highspeed neutrons smash into an iron nucleus. Some of these neutrons are captured, resulting in a highly unstable nucleus that eventually decays. In each decay step, a neutron is converted into a proton. Write the overall nuclear equation for the absorption of six neutrons by an iron-56 nucleus and their decay to six protons.