Nuclei of iron atoms have some of the highest binding energies per nucleon, surpassed only by the nickel isotope 62-Ni. The universally most abundant of the highly stable nuclides is, however, 56-Fe. This is formed by nuclear fusion in stars. Although a further tiny energy gain could be extracted by synthesizing 62-Ni, conditions in stars are unsuitable for this process to be favoured.
Iron (as Fe2+, ferrous ion) is a necessary trace element used by almost all living organisms. The only exceptions are several organisms that live in iron-poor environments and have evolved to use different elements in their metabolic processes, such as manganese instead of iron for catalysis, or hemocyanin instead of haemoglobin. iron-containing enzymes, usually containing heme prosthetic groups, participate in catalysis of oxidation reactions in biology, and in transport of a number of soluble gases.
iron is the sixth most abundant element in the Universe, formed as the final act of nucleosynthesis, by silicon fusing in massive stars. About 1 in 20 meteorites consist of the unique iron-nickel minerals taenite (35–80% iron) and kamacite (90–95% iron).
The red color of the surface of Mars is derived from an iron oxide-rich regolith.
The base value of each unit of ranges between 1 and 5Ð per unit, with up to 10 units being found at any one time.
Presence on Mars: Very Common
|Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6|
|Group 1|||Aluminum | Arsenic | Beryllium | Boron | Calcium | Cantite | Carbon | Chlorine | Chromium | Cobalt | Copper | Flourine | Helium| | Hydrogen | Iron | Lithium | Magnesium | Manganese | Nickel | Oxygen | Phosphorus | Plesium | Potassium | Silicon | Sodium||