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This Review contains major "Rhenium"- related terms, short phrases and links grouped together in the form of Encyclopedia article.
- Rhenium is a silvery white metal, lustrous, and has one of the highest melting points of all elements, exceeded by only tungsten and carbon.
- Rhenium is a chemical element in the periodic table that has the symbol Re and atomic number 75.
- Rhenium is a fairly dense, soft metal, which is next to osmium on the periodic table of chemical elements.
- Rhenium is a precious metal that is not part of the platinum group or one of the traditional precious metals.
- Rhenium is a byproduct of refining molybdenum from copper ores.
- Rhenium forms a superconductive alloy with molybdenum.
- Rhenium sulfide is associated with molybdenum in the ores.
- Commercial rhenium is extracted from molybdenum roaster-flue gas obtained from copper-sulfide ores.
- Actually, naturally occurring rhenium is composed of 2 stable isotopes and 26 unstable ones.
- Situated in Group 7 of the periodic table, it is expected to have properties similar to those of the rare metal rhenium.
- However, later analysis indicated the presence of rhenium (element 75), not element 43.
- The chemistry of technetium is said to be similar to that of rhenium.
- Rhenium diboride can be produced at ambient pressures, but is rather expensive because of rhenium.
- Rhenium was originally thought to form the rhenide anion, Re −, in which it has the −1 oxidation state.
- It is thought to be chemically similar to the rare metal rhenium.
- Commercially, rhenium is obtained through the processing of copper-sulfide ores that contain molybdenum.
- Rhenium catalysts are exceptionally resistant to poisoning from nitrogen, sulfur, and phosphorus, and are used for hydrogenation of fine chemicals.
- Annealed rhenium is very ductile and can be bent, coiled, or rolled.
- Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper refinement.
- Technetium also shows a stable +IV state whilst rhenium portrays stable +IV and +III states.
- Naturally occurring rhenium is 37.4% 185 Re, which is stable, and 62.6% 187 Re, which is unstable but has a very long half-life (~10 10 years).
- Naturally occurring rhenium is a mix of one stable isotope and one radioactive isotope with a very long half-life.
- The reaction also produced isotopes of its lighter homologues, technetium (as 108 Tc) and rhenium (as 169 Re).
- Rhenium is produced by reducing APR with hydrogen.
- In this purification, the molybdenum occurs as a sulfurous sludge, which, at elevated temperatures, releases rhenium.
- Rhenium metal is obtained as a powder by reduction of its compounds with hydrogen.
- Rhenium metal is prepared by reducing ammonium perrhentate with hydrogen at elevated temperatures.
- The only metal we could find that had the potential for doing this is rhenium; hence, we made rhenium diboride.
- Rhenium is silvery-white in appearance.
- Since rhenium and its compounds are used in very small amounts, very little is known about their toxicity.
- Rhenium was discovered as a trace element in the mineral columbite and in platinum ores.
- With an average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.
- As it is always present in small varying quantities in molybdenite the only commercial source for rhenium are molybdenum mines.
- Thus, while molybdenite and rhenium sulfide strongly absorb microwaves and become heated, molybdenum oxide is largely transparent to microwaves.
- Rhenium does not occur free in nature or as a compound in a distinct mineral species.
- It is a compound noted for its extreme hardness. Isotopes of rhenium are radioactive.
- A number of rhenium compounds are known, among them halides, oxides, and sulfides.
- So far, only a few rhenium compounds have been tested for toxicity, and these include rhenium trichloride and potassium perrhenate.
- Rhenium occurs with valences between +1 and +7 in compounds, as well as -1 and -3, but the oxidation states +7, +6, +4, +2 and -1 are the most common.
- The element has a melting point exceeded only by tungsten and rhenium.
- A silvery-white, rare, heavy, polyvalent transition metal, rhenium resembles manganese chemically and is used in some alloys.
- The catalyst for use herein preferably contains at least one of rhenium and silver.
- For certain reactions, for example the dehydrogenation of isopropyl alcohol, it is a far more effective catalyst than either rhenium or palladium.
- Sometimes platinum is combined with a second catalyst (bimetallic catalyst) such as rhenium or another noble metal.
- The hazardous property of rhenium halide, for example, may be attributed either to rhenium itself or to the other elements that make up the compound.
- In the periodic table of elements, rhenium is found as a third-row transition metal in group 7.
- As the metal, there may be mentioned metals belonging to Group 8 to Group 10 of the Periodic Table and rhenium.
- Rhenium, element 75 on the periodic table, belongs to the cluster of elements known as the transition group of elements.
- Technetium is placed in the seventh group of the periodic table, between rhenium and manganese.
- The chemistry of rhenium is similar to manganese.
- Above all, ruthenium, rhodium, palladium, iridium, platinum and rhenium are preferred.
- However, the price of rhenium has been fluctuating wildly recently and at the moment it is selling at 6,650 USD per ounce, just below rhodium.
- Re, chemical symbol - Re Re, symbol for the element rhenium.
- Rhenium has the widest range of oxidation states of any known element: -3, -1, 0, +1, +2, +3, +4, +5, +6 and +7.
- Rhenium has a stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in one other element (indium).
- Chemical properties of this element are intermediate between rhenium and manganese.
- The chemical properties of this silvery grey, crystalline transition metal are intermediate between rhenium and manganese.
- Since rhenium was discovered in 1925,[ 22] hafnium was the next to last element with stable isotopes to be discovered.
- This find made rhenium the last identified naturally occurring precious metal with stable isotopes.
- Natural rhenium is a mixture of one stable and one radioactive isotope of very long half-life, although most sources report two stable isotopes.
- At the Paul Scherrer Institute in Switzerland, it was shown that bohrium is a group 7 element, the big brother of rhenium, technetium, and manganese.
- Technetium resembles platinum in appearance and manganese and rhenium in chemical behaviour.
- Like rhenium and palladium, technetium can serve as a catalyst.
- Rhenium has a high melting point and a low vapor pressure similar to tantalum and tungsten, however, rhenium forms no volatile oxides.
- The primary decay products before W-184 are element 73 (tantalum) isotopes, and the primary products after are element 75 (rhenium) isotopes.
- In the periodic system, rhenium lies between tantalum (a refractory metal), and osmium, iridium and platinum (platinum group metals).
- The histories of these xenoliths have been investigated by many methods, including analyses of abundances of isotopes of osmium and rhenium.
- In geochemist's lingo, osmium is a compatible element while rhenium is strongly incompatible.
- Of the more easily obtainable ones, only osmium (22.6), iridium (22.4), platinum (21.45), rhenium (21.0) and tungsten (19.35) are denser than gold (19.32).
- Tantalum has an extremely high melting point, exceeded only by osmium, rhenium and tungsten, and is also very dense.
- Tantalum's high melting point of 3017 °C (boiling point 5458 °C) is exceeded only by tungsten and rhenium for metals, and carbon.
- HuNan HighTech Special Metals - Manufacturer and exporter of tantalum, niobium, tungsten, molybdenum, rhenium and indium metal products from China.
- It is preferred that the sulfides of molybdenum and rhenium be dried prior to reaction with microwaves.
- Molybdenum and rhenium are the elements most commonly observed with this bonding configuration.
- There are nine known precious metals - gold, platinum, iridium, palladium, osmium, silver, rhodium, ruthenium, and rhenium.
- The chemical properties of rhenium are like those of technetium, the element above it in Group 7 of the periodic table.
- It has a melting point of 2623°C, and only tantalum, osmium, rhenium and tungsten have higher melting points.
- Natural Resources > Minerals > Metals > Molybdenum
- Natural Resources > Minerals > Metals > Osmium
- Nature > Chemistry > Chemical Elements > Technetium
- Encyclopedia of Keywords > Nature > Chemistry > Tungsten
- Chemical Properties
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