Tellurium	By Rylan Ms. Eagles 8th Grade Class Mill Valley Middle School Marin ,CA
'If your thinking about touching Tellurium you might grab a chair, because this substance should be handled with care." •History •Uses •Properties •Isotopes •Cost •Bibliography •Glossary
History Tellurium was discovered by Muller von Reichenstien in 1782. It was named by Klaproth, who isolated it in 1798. Tellurium is occasionally found native, but is more found as the telluride of gold(calaverite), and combined with other metals. It is recovered commercially from the anode mud that are produce during the electrolytic refining of blister copper. The U.S., Canada, Peru, and Japan are the largest Free World producers of the element.		Uses Tellurium improves the machinability of copper and stainless steel, and its addition to lead decreases the corrosive action of sulfuric acid on lead and improves its strength and hardness. Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for shill control. Tellurium is used in ceramics.
	Properties Crystalline tellurium has a silvery- white appearance, and when pure exhibits metallic luster. It is brittle and easily pulverized. Amorphous tellurium is found by precipitating tellurium from a solution telluric acid.
Isotopes Thirty isotopes of tellurium are known, with atomic masses ranging from 108 to 137. Natural tellurium consist of eight isotopes.		Cost Tellurium cost about $100/Ib, with a purity of about 99.5%
	Bibliography Ms. Eagle Web Page Physical Science Textbook Google Dictionary I got my images from: http://animatedgif.net/science/science.shtml
Glossary Calaverite: A bronze-yellow massive mineral with metallic luster; a telluride of gold; -- first found in Calaveras County California Corrosive Action: Having the capability or tendency to cause corrosion: a corrosive acid Isotopes: One of two or more atoms having the same atomic number but different mass numbers. Luster: The appearance of a mineral surface judged by its brilliance and ability to reflect light. Pulverized: To pound, crush, or grind to a powder or dust. To demolish. Sulfuric Acid: A highly corrosive, dense, oily liquid, H2SO4, colorless to dark brown depending on its purity and used to manufacture a wide variety of chemicals and materials including fertilizers, paints, detergents, and explosives. Also called oil of vitriol, vitriol.