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.
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Famous quotes containing the word iron:
“Or bid the soul of Orpheus sing
Such notes as, warbled to the string,
Drew iron tears down Pluto’s cheek,
And made Hell grant what love did seek;”
—John Milton (1608–1674)
“Already the iron door of the north
Clangs open: birds, leaves, snows
Order their populations forth,
And a cruel wind blows.”
—Stanley Jasspon Kunitz (b. 1905)
“As a people, we have the problem of making our forests outlast this generation, or iron outlast this century, and our coal the next; not merely as a matter of convenience or comfort, but as a matter of stern necessity.”
—William Howard Taft (1857–1930)