Zinc

http://www.chemicalelements.com/elements/zn.html
 * Authors : Alex Nole and Katelyn Jacques**

Zinc is an essential mineral, necessary for sustaining all life. Enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as the alcohol dehydrogenase in humans. Consumption of higher concentrations of zinc can cause ataxia, lethargy and copper deficiency. http://en.wikipedia.org/wiki/Zinc
 * Zinc** is a metallic chemical element with the symbol **Zn** and atomic number 30. Although zinc was used in the copper-zinc alloy brass since Roman times, and the metal was produced in large scale in India around 1200 AD, the pure metal was unknown to Europe until the end of the 16th century. Industrial-scale production in Europe had not started until the late 18th century. Corrosion-resistant zinc plating of steel is the major application for zinc. Other applications are in batteries and alloys, such as brass. Sphalerite a zinc sulfide is the most important zinc ore. Zinc production includes roastingl eaching and, at the end, pyrometallurgic winning or electrowinning.

__**Biological Role**__ Zinc is an essential element, necessary for sustaining all life. It is estimated that 3000 of the hundreds of thousands of proteins in the human body contain zinc.

__**Health Hazards**__ Zinc is used in large quantities in the manufacture of brass, galvanized metals, and various other alloys. Inhalation of zinc oxide fumes can occur when welding or cutting on zinc-coated metals. Exposure to these fumes is known to cause metal fume fever. Symptoms of metal fume fever are very similar to those of common influenza. They include fever (rarely exceeding 102o F), chills, nausea, dryness of the throat, cough, fatigue, and general weakness and aching of the head and body. The victim may sweat profusely for a few hours, after which the body temperature begins to return to normal. The symptoms of metal fume fever have rarely, if ever, lasted beyond 24 hours. The subject can then appear to be more susceptible to the onset of this condition on Mondays or on weekdays following a holiday than they are on other days.

Date of Discovery:** 1746
 * __Zinc Facts:__
 * Discoverer:** Andreas Marggraf
 * Name Origin:** From the German word //zin// (meaning tin)
 * Uses:** metal coating, rust protection, brass, bronze, nickel
 * Obtained From:** zinc blende, calamine

http://csep10.phys.utk.edu/astr162/lect/light/bohr.html
 * __Bohr Model:__**
 * [[image:http://csep10.phys.utk.edu/astr162/lect/light/bohrframe/bohr2.gif width="200" height="200"]] ||


 * Zinc is silver in color.**
 * Atomic Number:** 30
 * Symbol:** Zn
 * Atomic Weight:** 65.39
 * Discovery:** known since prehistoric time
 * Electron Configuration:** [Ar] 4s2 3d10
 * Word Origin:** German //Zink//: of obscure origin, probably German for tin
 * Isotopes:** There are 21 known isotopes of zinc, 5 stable and 16 unstable. Natural zinc contains the 5 stable isotopes.
 * Properties:** Zinc has a melting point of 419.58°C, boiling point of 907°C, specific gravity of 7.133 (25°C), with a valence of 2. Zinc is a lustous blue-white metal. It is brittle at low temperatures, but becomes malleable at 100-150°C. It is a fair electrical conductor. Zinc burns in air at high red heat, evolving white clouds of zinc oxide.

Zinc is mainly used a protective coating for iron and steel || Zinc boosts brain activity || Zinc is also used as a main alloy for Brass. || Zinc oxide, known as zinc white or Chinese white, is used as a paint pigment. || Zinc chloride is used as a wood preservative and as a soldering fluid. || Zinc Sulfide is a phosphor for the screens of television tubes and in fluorescent coatings || Zinc is also used for medical purposes
 * [|State at 25°C:] || solid ||
 * [|Density (g/cm3):] || 7.14 ||
 * [|Hardness (Mohs):] || 2.5 ||
 * [|Melting Point (K):] || 692.78 ||
 * [|Boiling Point (K):] || 1180 ||
 * [|Heat of Fusion (kJ/mol):] || 6.7 ||
 * [|Heat of Vaporization (kJ/mol):] || 115 ||
 * [|Heat of Atomization (kJ/mol):] || 131 ||
 * [|Therm. Conductivity (J/m sec K):] || 116 ||
 * [|Elec. Conductivity (1/mohm cm):] || 169.033 ||
 * [|Abundance, Solar System:] || 3.100 ||
 * [|Abundance, Earth's Crust:] || 1.79 ||
 * [|Pure Cost ($/100g):] || $ 3.70 ||
 * [|Bulk Cost ($/100g):] || $ 0.12 ||
 * [|Source:] || Sphalerite (sulfide) ||
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 * Video:http://www.teachertube.com/view_video.php?viewkey=0db4f3c3f68071790ad7**

Sweet we have to be missing something tho but oh well i guess.