Question

How is Iron Formed? (its orgin)?

Answer 1

@hartnn @ujjwal @Shane_B

Answer 2

what am i supposed to answer?

By atoms?

Answer 3

not in the sense of atom abt its orgin

Answer 4

Sometimes by radioactive disintegration of some heavier elements..

Answer 5

well, u ll hv to get into to the origin of all elements

starting from Big BAng theory

to hydrogen n helium...the lighter ones

n they condense to form heavier ones like iron

Answer 6

Iron is one of Earth's most abundant elements. It formed when the Earth was being formed. As the Earth got bigger the iron seeped into the crust of the earth. Follow my link for more details: http://hyperphysics.phy-astr.gsu.edu/Hbase/pertab/fe.html
Of course man makes iron as well. We have gotten smart in our old age.

Answer 7

Iron, uniquely among all elements, can actually be formed either from the fusion of lighter elements, or the fission of heavier. It is the most stable nucleus there is. (That fact is why there is so much of it.)

In fact, it's believed most of the iron has been formed by the fusion of lighter elements, because heavier elements are very rare -- themselves only being formed in supernova explosions. However, very few stars ever get hot enough and dense enough in their core to be making iron. One of the typical paths is this one:
\[{}^{28}{\rm Si} + 7\thinspace {}^{4}{\rm He} \rightarrow {}^{56}{\rm Ni} \rightarrow {}^{56}{\rm Co} + e^+ \rightarrow {}^{56}{\rm Fe} + e^+\]Here seven helium nuclei fuse with a silicon nucleus to give you an unstable nucleus of nickel, which decays in two steps to form a stable nucleus of iron.

This kind of reaction can occur in the very center of the largest stars, which have accumulated helium, silicon, carbon and oxygen by fusion reactions starting from hydrogen. It also of course happens in nova and supernova explosions, when there is so much energy that all kinds of fusion and fission reactions happen.

An interesting fact is that because iron is the most stable nucleus, once iron starts forming in a star's core, there is no further reaction that can take place to provide energy. As more and more iron accumulates, it begins to contract under its gravitational self-attraction. It gets very hot indeed, but there is no reaction that can provide outward pressure to counter the gravitational pull inward. If the star blows up or runs out of fusion fuel before too much iron accumulates, then the star ends its life as a white dwarf (non-fusing star) that is mostly made of iron. But if too much iron has accumulated, the iron core will collapse into a neutron star, or even black hole.