WebElements http://www.webelements.com/ Periodic Table on the web. Lists essential information about each
element with descriptions, graphics, and movies for some. Can view either
the professional edition or the scholar edition.
Lenntech
Peridic Table http://www.lenntech.com/periodic-chart.htm
Each chemical element contains a link to a page that explains its chemical
properties, health effects, environmental effects, application data,
an image and also information of the history/inventor of each element.