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As 99.9% pure thorium oxide, price per thorium contained. Free on Board port of entry, duty paid. 91: Pa: Protactinium: 15.37: 1.4×10 −6 [i] (3.878 × 10 10 kg) No reliable price available. In 1959–1961 Great Britain Atomic Energy Authority produced 125 g of 99.9% pure protactinium at a cost of $ 500 000, giving the cost of 4 000 000 USD ...
Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [6] [7] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...
As of 21 November 2022, the platinum spot price in New York was $980 [9] per ounce, compared to $1,742 per ounce for gold [10] and $20.84 per ounce for silver. [11] Platinum is traded in the spot market with the code "XPT". When settled in United States dollars, the code is "XPTUSD". As the cost of platinum per ounce fell, the cost per ounce ...
In 1973, metal dealers established "London Platinum and Palladium Quotation"—a forerunner of the fixings. The prices for platinum and palladium were settled twice a day on the spot market. In 1979, leading dealers from London and Zurich signed an agreement to standardize the origin and specifications of the metals of the good delivery quality.
The set's release on December 13, 2007, at a price of $1,949.95 (around $475 above platinum spot) with a seven-day one-set-per-household limit was met with strong collector interest. [32] First week sales reached 14,682 units, almost half of the maximum ordered mintage of 30,000 units.
Platinum–iridium alloy. The international prototype of the kilogram (IPK) is an artifact standard of platinum–iridium alloy that was defined as having a mass of exactly one kilogram. Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium . Typical alloy proportions are 90:10 or 70:30 (Pt:Ir).
Naturally occurring platinum and platinum-rich alloys were known by pre-Columbian Americans for many years. [5] However, even though the metal was used by pre-Columbian peoples, the first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger (1484–1558) as a description of a mysterious metal found in Central American mines between ...
For a long period, the United States government set the value of the US dollar so that one troy ounce was equal to $20.67 ($0.665 per gram), but in 1934 the dollar was devalued to $35.00 per troy ounce ($0.889/g).
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