selenium

Element name: Selenium
 * __ SELENIUM__ **

Element symbol: Se

Element number: 34

Most common mass number: 78.96

Physical state at room temperature: Solid at 298 K

Meaning of the name latin/greek name: The name is derived from the greek name __slene__ which means __moon__

Uses of the element: Used in photoelectric cells, tv cameras, and semiconductor in batteries

Biological importance of the element: Essential to mammals and higher plants but in small amounts. Also stimulated metabolism

Who discovered it: Jons Berzelius in 1817

How was it discovered: Berzelius reported that tellurium was in sulphuric acid from a swedish factory, but in the following year decided the impurity was not tullurium but it was infact selenium

Pysical properties of element: Non-metal element located between sulfur and tellurium. Exists in several allotrophic forms

Chemical properties of element: Has been diagnostic applications of medicine. Artificial radioactive isotopes of selenium have also been created by neutron activation

Sources cited: www.webelements.com/selenium/physics.html www.atsdr.cdc.gov/toxprofiles/tp92-c4.pdf www.environmentalchemistry.com www.webelements.com

Pictures of selenium: Videos of selenium: http://www.youtube.com/watch?v=IHrUtKjcAFE http://www.youtube.com/watch?v=GFIvXVMbII0
 * The element song:


 * Holly Salerno