The Chemistry of Vanadium, Niobium and Tantalum gives a comprehensive discussion on the discovery, origin, and metallurgical aspects of vanadium, niobium, and tantalum. A section is also focused on the nuclear properties, as well as the physical and chemical properties of each compound.
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Aug 19, 2013· Facts About Tantalum. ... It was thought tantalum and niobium were identical elements until Rowe in 1844, and Swiss chemist Jean Charles Galissard de .
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Tantalum definition, a gray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and apparatus.
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Tantalum is found in the minerals tantalite, microlite, wodginite, euxenite, and polycrase. Tantalum was first discovered by Anders G. Ekeberg in 1802 in Uppsala, Sweden. Due to the close relation of tantalum to niobium in the periodic table, Tantalum's name originates from the Greek word Tantalos, meaning Father of Niobe in Greek mythology.
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![Tantalum and niobium. (Book, 1959) []](/5ljkvqm/102.jpg)
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NIOBIUM AND TANTALUM NIOBIUM Niobium is a soft silverygrey metal that resembles freshcut steel. It neither tarnishes nor oxidizes in air at room temperature because of a thin coating of niobium oxide. It does readily oxidize at high temperatures (above 200ºC), particularly with oxygen and halogens. Niobium is not attacked by cold acids but
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Niobium and tantalum provide no counterpart to the cationic chemistry of vanadium in the +3 and +2 oxidation states. Instead, they form a series of "cluster" compounds based on octahedral M 6 X 12 units. The occurrence of such compounds is largely a consequence of the strength of metalmetal bonding in this part of the periodic table (as reflected in high enthalpies of atomization), and ...
— Jay Bennett, Popular Mechanics, "Scientists Create Most Accurate Estimate of Earth's Composition," 18 Sep. 2017 China's Limac Corp. and North Korea's Ryonbong General Corp. set up a joint venture in 2008 to mine tantalum, niobium and zirconium, minerals that are useful in making phones and computers but also nuclear reactors and ...
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