### element:

Tellurium
* are chemical elements
  - minerals
* causes dose-dependent coordinate downregulation of myelin gene expression.
* forms many compounds, but none that are commercially important.
* gives a garlicky-odor to the breath.
* grayish-white solid with a shiny surface.
* improves the machinability of copper and stainless steel.
* is also available in soluble forms including chlorides and nitrates.
  - unreactive element
  - chemically related to selenium and sulfur
  - far more common in the universe as a whole than on Earth
  - obtained commercially today as a by-product in copper and lead refining
  - one of the rarest elements in the Earth's crust
  - produced mainly in the United States, Peru, Japan and Canada
* is recovered as a by-product of copper ore refining
  - byproduct of the electrolytic refining of blister copper
  - uneffected by water or hydrochloric acid, but dissolves in nitric acid
* is used as an alloying agent
  - to improve the machinability of copper and stainless steel
  - very toxic and therefore requires strict precautions to be taken during steelmaking
* lustrous, brittle, crystalline, silver-white metalloid.
* p-type semiconductor, and shows varying conductivity with crystal alignment.
* rare element.
* semiconductor and is frequently doped with copper , tin , gold or silver
  - material and is slightly photosensitive
* semimetallic, lustrous, crystalline, brittle, silver-white element.
* silvery-white shiny solid.
* very rare mineral.
+ Tellurium, Occurrence
  * Tellurium is a very rare mineral. There is 14 times more silver in the earth than there is tellurium. Tellurium is sometimes found as an element, but most of the times is found as tellurides. They are valuable ores of both tellurium and gold. This gold ore was not recognized as gold during one gold rush and was used as a filler. It was then discovered that it was gold telluride, making another gold rush
  - Properties, Chemical properties: Semimetals
  * Tellurium is an unreactive element. It can react with reactive metals to make tellurides. It can burn in air to make tellurium dioxide. It can be oxidized even more to tellurium trioxide. It does not corrode. The chemistry of tellurium is similar to some chemistry of selenium and sulfur, although its compounds are more reactive and the element is less reactive

### element | tellurium:

Tellurium trioxide
* can come in two forms.
+ Tellurium trioxide, Properties: Tellurium compounds :: Oxides
  * Tellurium trioxide can come in two forms. There is a yellow-red form and a gray form. The yellow red form is more reactive. It is a powerful oxidizing agent. It reacts with strong bases to make tellurates. It releases oxygen to turn into tellurium dioxide when heated.

### element:

Trace element
* All trace elements are toxic when fed in excessive quantities
  - can be toxic in high doses
* are chemical elements normally present in very small amounts in living organisms
  - critically important for our health and for the development of the brain
  - elements present in the environment and organisms at low concentrations
  - essential when they serve in a specific biochemical function
  - generally present in small concentrations in natural water systems
  - nutrients needed in very small amounts
* emit characteristic wavelengths of light when heated to incandescence.
* influence the cathodeluminescent color of the mineral.
* is an element
* play an important role in the diet of dairy cattle
  - essential roles in the maintenance of physiological processes

Transition element
* All transition elements metallic in free state.
* Many transition elements do have characteristic colors in solution.
* can often form different ions.