Is cold fusion science or pseudoscience

Ireally need this answer sombody fast fast

What’s #16 asking me and how do i solve it?

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?