selenium_element_card.001.jpgSelenium



Atomic Number: 34

Electrons: 34

Neutrons: 45

Average Atomic Mass: 78.96

Isotopes: 74Se, 76Se, 77Se, 78Se, 80Se, 82Se, 70Se, 71Se, 72Se, 73Se, 75Se, 79Se, 81Se, 83Se, 84Se.

Discovery: Jons Jacob Berzelius discoverd selenium.He reported that tellurium was present in sulphuric acid from a Swedish factory, but in the following year decided that the impurity was not tellurium but another closely related element that he subsequently identified as selenium.

Name: Came from the greek word "Selene" wich means moon.

Uses: It is used in stainless steel.

Interesting Facts:Selenium exhibits both photovoltaic action, where light is converted directly into electricity, and photoconductive action, where the electrical resistance decreases with increased illumination.

Video:
Sources
Selenium on the Periodic Table of Videos
history of selenium webelements
isotopes of selenium web elements
nealrabogliatti's photostream on flickr
Uses of Selenium on webelements