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It's Elemental" periodical table of elements at Jefferson Lab. Click on an element to view details and history of the element.
Online, Interactive Periodic Table of the Elements at Chemical Elements.com, created and maintained by Yinon Bentor. (Originally created as an 8th grade science project in 1996, Mr. Bentor continues to update the site.)
Chemical Elements Table at Infoplease. The elements are listed in alphabetical order, with links to detailed information on each element.
Chemical Elements listed in alphabetical order at Chemistryexplained.com.
Periodic table of the elements at Lenntech. "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."
Periodic Table of the Elements at Chemicool.com, created by a professor at MIT, and currently maintained by Dr. Doug Stewart.
Periodic Table of the Elements at Ptable.com. The table links to the Wikipedia article for each element.