What is the relation betwen iron and copper?

The chemical element iron has the symbol Fe and the atomic number 26. It is a metal that belongs to the periodic table's first transition series and group 8. It is the most abundant element on Earth by mass, just ahead of oxygen, and it makes up much of the planet's outer and inner core.
Copper, on the other hand, is a chemical element with the symbol Cu (derived from the Latin word cuprum) and atomic number 29. It's a pliable, malleable, and ductile metal with excellent thermal and electrical conductivity. Copper is one of the few metals that may be found in an useful metallic state in nature (native metals)