Elizabeth

Silicon toc

Jing Screen Cast:
media type="file" key="Silicon-Bogue.swf"

History:
In 1800, Davy thought silicon to be a compound, but in 1811, Gay Lussac and Thenard probably created impure amorphous silicon by heating potassium with silicon tetrafluoride. In 1824, Berzelius prepared amorphous silicon by the same method, and purified the product by removing the salt of fluosilicic acid by repeated washings. Deville in 1854 first prepared crystalline silicon, the second cystalline structural form of the element. It was first found in Stockholm, Sweden.

Properties:
Boiling Point: 2355.0 °C Melting Point: 1414.0 °C Freezing Point:1410°C Color: Grey-Black Structure: Crystalized Cubic Most Common State: Solid Appearance: Amorphous silicon is a brown powder, and crystalline silicon is a grey color with a metallic luster. Density at  **293 K:** 2.329 g/cm  3 Classification: Mettaloid 

Modern Uses and Locations:
<span style="font-family: Georgia,serif">Silicon was found by Berzelius in Sweeden. It is a very common element, it is the most abundant element in Earth's crust. (Therefore it is found all over the world!) In the form of sand and clay, Silicon is used to make concrete and brick. In the form of silicates it is used to make pottery and enamel. S ilica (a sand) can be used to make glass. Silicon is also an important ingredient in steel. It is used as a semiconductor to make microchips for electronics (like your computer). Silicon is also used in solar cells, tools, cement, grease and oils. <span style="font-family: Georgia,serif">

<span style="font-family: Georgia,serif">Quick Facts:
<span style="font-family: Georgia,serif">Atomic Number: 14 <span style="font-family: Georgia,serif"><span style="font-family: Georgia,serif">Mass Number: 28  <span style="font-family: Georgia,serif"><span style="font-family: Georgia,serif"> Silicon is the second most abundant element in earth's crust. (Common) H as 3 stable isotopes: 28, 29, and 30. Regular Grade Silicon costs about $.50/gram 99.9% pure Silicon costs about $50/pound Hyperpure Silicon can cost as much as $100/ounce The name Silicon comes from the Latin word for flint: //silex.// <span style="font-family: Georgia,serif">

<span style="font-family: Georgia, serif">Images:
Thanks to Le Pimento for the picture.

<span style="font-family: Georgia,serif">Sites:
<span style="font-family: Georgia,serif"> Bentor, Yinon. "Silicon." Chemical Elements. 8 Nov. 2008 <http://www.chemicalelements.com/elements/si.html>. Gagnon, Steve. "Silicon." It's Elemental. Jefferson Lab. 9 Nov. 2008 <http://education.jlab.org/itselemental/ele014.html>. Le Pimento. "silicon_silicium." Creative Commons. Flickr. 16 Nov. 2008 <http://www.flickr.com/photos/lepimento/2813057492/>. "Silcon." 15 Dec. 2003. University of California for the U.S. Department of Energy. 9 Nov. 2008 <http://periodic.lanl.gov/elements/14.html>. "Silicon." The Gayle Encyclopedia of Science. 3rd ed. 2004. "Silicon." Periodic Table of Elements. Radiochemestry Society. 8 Nov. 2008 <http://www.radiochemistry.org/periodictable/elements/14.html>. Visual Elements:Silicon. Chem soc. 9 Nov. 2008 <http://www.rsc.org/chemsoc/visualelements/PAGES/data/silicon_data.html>. <span style="font-family: Georgia,serif"> <span style="font-family: Georgia,serif">