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:
“Persistence can grind an iron beam down into a needle.”
—Chinese proverb.
“The majority of the men of the North, and of the South and East and West, are not men of principle. If they vote, they do not send men to Congress on errands of humanity; but while their brothers and sisters are being scourged and hung for loving liberty,... it is the mismanagement of wood and iron and stone and gold which concerns them.”
—Henry David Thoreau (1817–1862)
“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)