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As of 2020, the most expensive non- synthetic element by both mass and volume is rhodium. It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.
American Platinum Eagle, the official platinum bullion coin of the United States. Platinum as an investment is often compared in financial history to gold and silver, which were both known to be used as money in ancient civilizations. Experts posit that platinum is about 15–20 times scarcer than gold and approximately 60–100 times scarcer ...
The International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur -kilogram, [1] [2] or urkilogram, [3] particularly by German-language authors writing in English [3] [4]: 30 [5] : 64 ) is an object whose mass was used to define the kilogram from 1889, when it replaced the Kilogramme des ...
Platinum–iridium alloy. 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). These have the chemical stability of platinum, but increased hardness. The Vickers hardness of pure platinum is 56 HV while platinum with 50% of iridium can reach over ...
Rank Country/Region Platinum production (kilograms) Year World 180,000 2019 1: South Africa: 130,000 2019 2: Russia: 22,000 2019 3: Zimbabwe: 15,000 2019 4: Canada
1967–Present. Discovered in 1951, Jaduguda Mine has the distinction of being the first uranium mine of the country. The mine is accessed through two 5-metre (16 ft) diameter vertical shafts of depth of 640 m (2,100 ft), attaining a total depth of 905 m (2,969 ft). Narwapahar Mine. Jharkhand. Jadugora, East Singhbhum. Uranium Corporation of India.
Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes. It is one of the rarer elements in Earth's crust, with an average abundance of approximately 5 μg /kg. It occurs in some nickel and copper ores along with some native deposits, mostly in South Africa ...
Kingdom of Sikkim joined the Indian Union in 1975. [6] ^ Chennai (Madras) was the capital of the Madras Presidency since 1839, which was redrawn as Madras State in 1956. Madras State was renamed Tamil Nadu in 1968. Hyderabad was the jure joint capital of Andhra Pradesh and Telangana until 2024. Shillong was the joint capital of Assam and ...
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