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transition metal | A Wisdom Archive on transition metal | | transition metal A selection of articles related to transition metal | |
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ARTICLES RELATED TO transition metal | |
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| | |  transition metal: Encyclopedia - GoldGold is a chemical element in the periodic table that has the symbol Au (L. aurum) and atomic number 79. A soft, shiny, yellow, dense, malleable, ductile (trivalent and univalent) transition metal, gold does not react with most chemicals but is attacked by chlorine, fluorine and aqua regia. The metal occurs as nuggets or grains in rocks and in alluvial deposits and is one of the coinage metals.
For millennia, gold has served as money and is also used in jewellery, dentistry, and in electronics. Gold forms t ...
Including:
Read more here: » Gold: Encyclopedia - Gold |
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| | | | transition metal: Encyclopedia II - Molybdenum - Biological role Molybdenum has been found to have a role in the biology of all classes of organisms. It is found in two groups of enzymes, the nitrogenases and the molybdopterins.
The nitrogenases are found in bacteria, and are involved in the pathways of nitrogen fixation. The bacteria may be found inside plants. The molybdenum atom is present in a cluster(see cluster chemistry), which includes iron and sulfur atoms. The name molybdopterin is misleading as the group of enzymes includes tungsten-containing enzymes, and the word "molybdopterin" does n ...
See also:Molybdenum, Molybdenum - Notable characteristics, Molybdenum - Applications, Molybdenum - History, Molybdenum - Occurrence, Molybdenum - Biological role, Molybdenum - Isotopes, Molybdenum - Precautions, Molybdenum - Toxicity in animals Read more here: » Molybdenum: Encyclopedia II - Molybdenum - Biological role |
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| | | | transition metal: Encyclopedia II - Osmium - Notable characteristics Osmium in a metallic form is extremely dense, blue white, brittle and lustrous even at high temperatures, but proves to be extremely difficult to make. Powdered osmium is easier to make, but powdered osmium exposed to air leads to the formation of osmium tetroxide (OsO4), which is toxic. The oxide is also a powerful oxidizing agent, emits a strong smell and boils at 130°C.
Due to its very high density osmium is generally considered to be the heaviest known element, narrowly defeating iridium. However, calculations of densi ...
See also:Osmium, Osmium - Notable characteristics, Osmium - Applications, Osmium - History, Osmium - Occurrence, Osmium - Compounds, Osmium - Isotopes, Osmium - Precautions Read more here: » Osmium: Encyclopedia II - Osmium - Notable characteristics |
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| | | | transition metal: Encyclopedia II - Zirconium - History Zirconium (Arabic zarkûn from Persian zargûn meaning "gold like") was discovered in 1789 by Martin Heinrich Klaproth and isolated in 1824 by Jöns Jakob Berzelius.
The zirconium containing mineral zircon, or its variations (jargon, hyacinth, jacinth, or ligure), were mentioned in biblical writings. The mineral was not known to contain a new element until Klaproth analyzed a jargon from Ceylon in the Indian Ocean. He named the new element Zirkonertz (zirconia). The impure metal was isolated first by Berzelius by heating ...
See also:Zirconium, Zirconium - Notable characteristics, Zirconium - Applications, Zirconium - History, Zirconium - Occurrence, Zirconium - Isotopes, Zirconium - Precautions Read more here: » Zirconium: Encyclopedia II - Zirconium - History |
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| | | | transition metal: Encyclopedia II - Platinum - Notable characteristics The metal appears silvery-white when pure, and firm. The metal is corrosion-resistant. The catalytic properties of the six platinum family metals are outstanding (a mixture of hydrogen and oxygen explodes in the presence of platinum). For this catalytic property platinum is used in catalytic converters, incorporated in automobile exhaust systems, as well as tips of spark plugs.
Platinum's wear- and tarnish-resistance characteristics are well suited for making fine jewelry. Platinum is more precious than gold. The price of platinum cha ...
See also:Platinum, Platinum - Notable characteristics, Platinum - Applications, Platinum - History, Platinum - Occurrence, Platinum - Isotopes, Platinum - Precautions, Platinum - Rarity and Color Read more here: » Platinum: Encyclopedia II - Platinum - Notable characteristics |
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| | | | transition metal: Encyclopedia II - Phosphor - Materials Phosphors are usually made from a suitable host material, to which an activator is added. The best known type is a copper-activated zinc sulfide and the silver-activated zinc sulfide (zinc sulfide silver).
The host materials are typically oxides, sulfides, selenides, halides or silicates of zinc, cadmium, manganese, aluminum, silicon, or various rare earth metals. The activators prolong the emission time (afterglow). In turn, other materials (eg. nickel) can be used to quench the afterglow and shorten the decay part of ...
See also:Phosphor, Phosphor - Materials, Phosphor - Glow in the dark toys, Phosphor - Radoactive light sources, Phosphor - Electroluminescence, Phosphor - White LEDs, Phosphor - Cathode ray tubes, Phosphor - Fluorescent lamps, Phosphor - Detergents, Phosphor - Various Read more here: » Phosphor: Encyclopedia II - Phosphor - Materials |
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| | | | transition metal: Encyclopedia II - Tungsten - Applications Tungsten is a metal with a wide range of uses, the largest of which is as tungsten carbide (W2C, WC) in cemented carbides. Cemented carbides (also called hardmetals) are wear-resistant materials used by the metalworking, mining, petroleum and construction industries. Tungsten is widely used in light bulb and vacuum tube filaments, as well as electrodes, because it can be drawn into very thin metal wires that have a high melting point. Other uses;
A high melting point also makes tungsten suitable for space-oriented and ...
See also:Tungsten, Tungsten - Notable characteristics, Tungsten - Applications, Tungsten - History, Tungsten - Biological role, Tungsten - Occurrence, Tungsten - Compounds, Tungsten - Aqueous polyoxoanions, Tungsten - Isotopes Read more here: » Tungsten: Encyclopedia II - Tungsten - Applications |
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| | | | transition metal: Encyclopedia II - Technetium - Occurrence and production Since technetium is unstable, only minute traces occur naturally in the Earth's crust as a spontaneous fission product of uranium. In 1999 David Curtis (see above) estimated that a kilogram of uranium contains 1 nanogram (1×10−9 g) of technetium. Extraterrestrial technetium was found in some red giant stars (S-, M-, and N-types) that contain an absorption line in their spectrum indicating the presence of this element.
In contrast with the rare natural occurrence, bulk quantities of technetium-99 are produced each year fr ...
See also:Technetium, Technetium - Notable characteristics, Technetium - Applications, Technetium - Nuclear medicine, Technetium - Industrial, Technetium - History, Technetium - Pre-discovery search, Technetium - Disputed 1925 discovery, Technetium - Official discovery and later history, Technetium - Occurrence and production, Technetium - Part of radioactive waste, Technetium - Reductive immobilization, Technetium - Chemical means, Technetium - Biological means, Technetium - Isotopes, Technetium - Stability of technetium isotopes, Technetium - Precautions Read more here: » Technetium: Encyclopedia II - Technetium - Occurrence and production |
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| | | | transition metal: Encyclopedia II - Mercury element - History Mercury was known to the ancient Chinese and Hindus and was found in Egyptian tombs that date from 1500 BC In China, India and Tibet, mercury use was thought to prolong life, heal fractures, and maintain generally good health. The ancient Greeks used mercury in ointments and the Romans used it in cosmetics. By 500 BC mercury was used to make amalgams with other metals.
The Indian word for alchemy is Rassayana which means ‘the way of mercury.’ Alchemists often thought of mercury as the first matter from which all metals were ...
See also:Mercury element, Mercury element - Applications, Mercury element - History, Mercury element - Dentistry, Mercury element - Medicine, Mercury element - Mineral occurrence, Mercury element - Compounds, Mercury element - Isotopes, Mercury element - Occurrence in the environment, Mercury element - Health and Environmental Effects, Mercury element - Precautions and regulation, Mercury element - Occupational exposure, Mercury element - Mercury in fish, Mercury element - Release of mercury into the environment, Mercury element - Mercury and aluminum Read more here: » Mercury element: Encyclopedia II - Mercury element - History |
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