Tellurium

Nguyen Cao 11/6 p.6
 * Tellurium, TE**

Tellurium is a grayish-white solid with a shiny surface. It has a melting point of 449.8°C (841.6°F) and a boiling point of 989.9°C (1,814°F). Its density is 6.24 grams per cubic centimeter. It is relatively soft. Although it has many metal-like properties, it breaks apart rather easily and does not conduct an electric current very well. -Tellurium does not dissolve in water. But it does dissolve in most acids and some alkalis. An alkali is a chemical with properties opposite those of an acid. - The compound formed between gold and tellurium is called gold telluride (Au 2 Te 3 ). -**Tellurium was discovered by Franz Joseph Müller von Reichenstein, a Romanian mining official, in 1782. - It got name from the Latin word for earth, **tellus**. -He also had an interest in chemistry and extracted a new metal from an ore of gold, known as aurum album, which he believed was antinomy. He shortly realized that the metal he had produced wasn't antimony at all, but a previously unknown element. Than Martin Heinrich Klaproth, a German chemist, mentioned the substance that Franz was created; he named the new element tellurium adn give credits to Franz. Health effects --- When taken internally, tellurium can have harmful effects. It may cause nausea, vomiting, and damage to the central nervous system. One interesting side effect is that it gives a garlicky-odor to the breath. Industrial uses - Tellurium uses very small amount of tellurium is used for minor applications. They use this element for big impact only. Used to improve the machining quality of metal products and to color glass and ceramics. Also used in thermoelectric devices, vulcanization of rubber, percussion caps, battery plate protectors and electrical resistors. Commercial uses-- - When pure tellurium is melted homogeneously and allowed to solidify in a vacuum-fairly unbelievable crystals. - CD-RW and DVD-RW disks use tellurium suboxide in the active data-recording layer.
 * Element Name:** Tellurium
 * Symbol:** Te
 * Atomic number:** 52
 * Atomic Mass:** 127.6
 * Number of Protons**: 52
 * Number of Electrons**: 76
 * Number of Neutrons:** 52
 * Common isotope:** 141/52 Te, 142/52 Te
 * Electron configuration**: [Kr] 5s2 4d10 5p4
 * Valence Electrons** : There are 6 valence electrons in tellurium On the 5th energy level, it's valence shel
 * Physical properties:**
 * Chemical properties:**
 * Element Classification:** Semi-metal **Period Number:** 5 **Group Number:** 16 **Group Name:** Chalcogen
 * History:
 * Element uses:**

--Tellurium is one of the rarest elements in the Earth's crust. Its abundance is estimated to be about 1 part per billion --Tellurium is in the same group as sulfur and selenium and forms similar compounds
 * Common forms** :

-Tellurium has eight stable isotopes. Te-120 and Te-123 are usually considered stable because of their long half lives and many of them have a medical application. Te-120 is used for the production of I-120g which has an application as a PET and Beta emitting isotope. Te-122 is used in the production of the radioisotope I-122 which is used in gamma imaging. Te-123 is used for the production of radioactive I-123 which is used in thyroid imaging. Te-124 is used for the production of both I-123 and the PET isotope I-124. Finally, Te-130 is used in the research into double Beta decay. ( http://www.tracesciences.com/te.htm ) -All this isotope is stable and thus has no decay products.
 * Stable Isotopes:**

-- there are 4 radioactive isotopes --  130 Te going to 2 beta mode to create daughter 130 Xe --  128 Te going to 2 beta mode to create daughter 128 Xe
 * Radioactive Isotopes**:


 * Photo:



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- Tellurium is hardly ever used in pure form, but these beautiful slender crystals are how it is distributed. Research is hindered by the fact that if you absorb even tiny amounts, you smell of garlic for months.

http://www.periodictable.com/Elements/052/index.html http://webelements.com/tellurium/ http://environmentalchemistry.com/yogi/periodic/Te.html http://www.chemicool.com/elements/tellurium.html
 * CREDITS:**