Iron

Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, where the production of nickel-56 (which decays to the most common isotope of iron) is the last nuclear fusion reaction that is exothermic. This causes radioactive nickel to become the last element to be produced before collapse of a supernova leads to the explosive events that scatter this precursor radionuclide of iron abundantly into space.

Famous quotes containing the word iron:

“A sense is what has the power of receiving into itself the sensible forms of things without the matter, in the way in which a piece of wax takes on the impress of a signet-ring without the iron or gold.”
—Aristotle (384–322 B.C.)

“Wilmer Cook: Keep on riding me, they’re gonna be picking iron out of your liver.
Sam Spade: The cheaper the crook, the gaudier the patter.”
—John Huston (1906–1987)

“Hate-hardened heart, O heart of iron,
iron is iron till it is rust.
There never was a war that was
not inward; I must
fight till I have conquered in myself what
causes war, but I would not believe it.”
—Marianne Moore (1887–1972)