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.

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