Rhenium is a actinic aspect with the attribute Re and diminutive amount 75. It is a silvery-white, heavy, third-row alteration metal in accumulation 7 of the alternate table. With an estimated boilerplate absorption of 1 allotment per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. The chargeless aspect has the third-highest melting point and accomplished baking point of any element. Rhenium resembles manganese chemically and is acquired as a by-product of molybdenum and chestnut ore's abstraction and refinement. Rhenium shows in its compounds a advanced array of blaze states alignment from −1 to +7.
Discovered in 1925, rhenium was the endure abiding aspect to be discovered. It was called afterwards the river Rhine in Europe.
Nickel-based superalloys of rhenium are acclimated in the agitation chambers, agent blades, and bankrupt nozzles of jet engines, these alloys accommodate up to 6% rhenium, authoritative jet engine architecture the better individual use for the element, with the actinic industry's catalytic uses getting next-most important. Because of the low availability about to demand, rhenium is a part of the a lot of big-ticket of metals, with an boilerplate amount of about US$4,575 per kilogram (US$142.30 per troy ounce) as of August 2011; it is aswell of analytical cardinal aggressive importance, for its use in top achievement aggressive jet and rocket engines.
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