The mass number is the number of protons and neutrons contained in the nucleus of the atom. Cobalt is stable in air and unaffected by water, but is slowly attacked by dilute acids. It actually produces gamma rays which can be used to detect internal flaws in metal in much the same way as x-rays by producing a shadowy image on film. The metal is not rare, and there are over a dozen countries where cobalt is produced. Cobalt is needed for the production of vitamin B 12. Young's modulus A measure of the stiffness of a substance.
If one imagines medieval mining conditions--miners worked in almost complete darkness and under extremely dangerous circumstances--then it's not surprising that ghosts and demons were prevalent in people's minds in those days. Ultimately, Nugen said, the idea is to engineer the phages to help detect, as well as isolate, dangerous bacteria. . The radioactive isotopes of cobalt are not present in the environment naturally, but they are released through nuclear power plant operations and nuclear accidents. Cobalt can also be used for the production of cemented carbides. In 1730, chemist Georg Brandt of Stockholm became interested in a dark blue ore from some local copper workings and he eventually proved that it contained a hitherto unrecognised metal and he gave it the name by which its ore was cursed by miners in Germany, where it was sometimes mistaken for a silver ore. Next, researchers use a magnet to attract the cobalt-iron nanoparticles, essentially yanking the phages and their bacteria loads out of the food sample.
Some compounds with the metal had been know since a thousand years before Christ, and they had been used to impart the deep blue color to glass. Cementation is the process where one metal is used to cover the coating of a second metal. The six water molecules are replaced by four chloride ions. Cobalt is used in magnets, ceramics, special glasses, and tools. More recently cobalt has a major use in newer batteries, magnetic particles for recording and storage information in magnetic tapes and hard drives.
In addition to being used as a dye, cobalt is also important to human nutrition as it is an essential part of vitamin B 12. Health effects Cobalt is a trace mineral in the human body. Mammals including humans require a small amount of cobalt. It is primarily mined in Zaire, Zambia, Russia, Canada and Cuba. Stephanie hails from East Tennessee, the global center for salamander diversity. Chlorine combines with all elements except the noble gases.
Cobalt is one of only three naturally occurring magnetic metals. Eventually, Brandt was given credit for the discovery of the element. In nutrition, cobalt is a trace mineral that forms part of thestructure of vitamin B12. Cobalt was discovered by Swedish chemist George Brandt in 1735. Compounds of Cobalt Cobalt is relatively abundant in nature at around 10 to 30 parts per million. The melting point of cobalt metal is 1,493°C 2,719°F , and the boiling point is about 3,100°C 5,600°F.
His work on methods of producing hydrochloric, nitric, and sulfuric acids was published in 1741 and 1743. Cobalt salts are used to impart permanent brilliant blue colors to glass, pottery, enamels, tiles, and porcelain. Myths were connected with the discovery of mineral resources, their extraction, and their processing. In particular, cobalt's very high melting point and mechanical strength at high temperatures has seen its extensive use in what is termed 'superalloys'. It has a wide variety of uses from an alloy forming element to a compound forming element that has applications as a pigment or a catalyst.
Although cobalt is used in electroplating to give objects an attractive surface that resists oxidation, it is more widely used to form alloys. Humans add cobalt by releasing small amounts into the atmosphere from coal combustion and mining, processing of cobalt-containing ores and the production and use of cobalt chemicals. In June 2014, Nugen and his team received a grant totaling nearly half a million dollars from the U. These values were determined using several different methods. Where did cobalt get its name? However, as far as colours go, cobalt has a few more strings to its bow than just this wonderful blue.
Cobalt is critical to industry. Cobalt compounds are commonly used to make colored glass, glazes, paints, rubber, inks, cosmetics, and pottery. She covers the world of human and animal behavior, as well as paleontology and other science topics. Where can you find cobalt? Extraction Cobalt is obtained by heating its ores to produce cobalt oxide Co 2 O 3. Around 60% of the world's cobalt supply comes from the mineral-rich Katanga Copper belt, in the Democratic Republic of the Congo. Electron configuration The arrangements of electrons above the last closed shell noble gas.
Cobalt was first discovered in 1735 by George Brandt in Stockholm Sweden. Extended exposures increase the risk of morbidity or mortality from cancer 6 The Cobalt -60, dispersed as nuclear fallout, creates what is sometimes called a dirty bomb or cobalt bomb, once predicted by physicist LeÃ³ SzilÃ¡rd as being capable of wiping out all life on earth. The higher the value, the larger risk there is to supply. Excess cobalt can also lead to health problems. The ocean floor north of Hawaii is thought to be covered with manganese nodules very rich in cobalt. Geological Survey estimates that 45% is currently used in superalloys chiefly for aerospace uses , 9% in magnet alloys, 9% in cemented carbides, 6% in other alloys including steel, and 30% in chemical and ceramic uses. The houses are now interspersed with dozens of mine pits where hundreds of creuseurs hunt for cobalt.
See the related link for further information. Cobalt-60 is also used to treat cancer, because the radiation it gives off kills cancer cells. This places it in the upper third of elements according to their abundance in the Earth's crust. The largest suppliers of cobalt are Zambia, Canada, Russia, Australia, Zaire, and Cuba. Physical properties Cobalt is a hard, gray metal that looks much like iron and nickel.