Smith,+Corinne

Tungston:

The symbol for Tungston is W, its boiling point is 5555 degrees celsius. It has a melting point of 3422 degrees Celsius and its atomic mass is 183.9 and its atomic number is 74. Tungston has 74 protons and electrons and it has 110 neutrons, its density is 19.3g/cm 3 squared. Its electron configuration is [Xe] 6s2 4f14 5d4 and it has valence electrons. Tungston was discovered by Fausto and Juan Jose de Elhyar in 1783, they discovered the element when they were doing an analysis for the mineral Wolframite. It is formed by reduction of acidified wolframite and charcoal. [] The liquid range is 2133 K and the superconduction temperature is 0.015 [or -273.135 °C (-459.64 °F)]K. the mineral hardness is 7.5 (no units) and has a reflectivity of 62%. These are all physical properties of Tungsten. Tungsten has been shown to act by antagonizing the action of the essential trace element Molybdenum. It also irritates the skin an the eyes. We know this because of industrial experiences when people worked with the element. [] Tungsten is found in ores of Wolframite and Scheelite these elements are found in a lot of different countries including the U.S and England. At room temperature, tungsten does not react with air or oxygen, O2. At elevated temperatures (red heat), the trioxide tungsten(VI) oxide, WO3, is formd. Finely divided tungsten metal is pyrophoric . The cost or value of this substance is 11$ per 100 grams. Tungsten is useful for glass-to-metal seals since the thermal expansion is about the same as borosilicate glass and it is used for electrical contact points for car distributors and are also windings and heating elements for electrical furnaces. An unusual fact about this element is that Tungsten has the highest melting point and lowest vapor pressure of all metals. It also has excellent corrosion resistance and is not attacked easily by most mineral acids, so it is used a lot for glass-to-metal seals.

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 * //http://www.rsc.org/periodic-table/ //****. Royal Society of Chemistry 2013, 2013. Web. 4 Mar. 2013. **


 * <http://www.rsc.org/periodic-table/>. [[image:bohr modle.jpg width="180" height="180"]] **