<Li> Superconductors, as components in alloys with other metals . </Li> <P> Nickel has an important role in the biochemistry of organisms, as part of the active center of enzymes . None of the other group 10 elements have a known biological role, but platinum compounds have widely been used as anticancer drugs . Aside from nickel, the elements are toxic for organisms . </P>

To which major group do iron cobalt and nickle belong