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Chemistry
Royal Society of Chemistry
The Royal Society of Chemistry is the world's leading chemistry community, advancing excellence in the chemical sciences, and the UK's professional body for chemical scientists.
http://www.rsc.org/
The Periodic Table of Videos
Tables charting the chemical elements have been around since the 19th century, but this modern version from the University of Nottingham has a short video about each one, featuring real working chemists.
http://www.periodicvideos.com/
WebElements Periodic Table
The periodic table of the chemical elements, including each element's electronic, physical and nuclear properties, discoverer, name origin, uses, crystallography and compounds.
http://www.webelements.com/