Chemical Elements History and Information Selenium
About the chemical element Selenium, its symbol, atomic number and weight, who discovered it and when.
The Atomic Elements and Their Uses
(Element) (Symbol) (Atomic number) (Atomic weight)
Selenium Se 34 78.96
Discovered by jons Berzelius of Sweden in 1818. The heart of the XeroxÆ machine is a cylinder coated with selenium. The image falling on this coating produces static charges where dark shadows fall. The static charges attract dry powdered ink particles, which are then pressed and baked onto paper to make the copy. The vidicon tube in a TV camera is also based on a selenium image-producing surface.
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