calculate the binding energy per nucleon of 26Fe^56.(Mass of proton =1.007825 amu, mass of neutrons=1.008665 amu, mass of 25Fe^56= 55.934939 amu and 1 amu =931 MeV)

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?