Again via StumbleUpon, I found this very nice interactive version of the periodic table. The elements are color-coded according to their orbital configuration, and hovering the mouse over an element gives you all the significant chemical properties. I find myself uncontrollably wandering the table, looking at various elements, which probably means it serves as an excellent teaching tool!
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I liked it too – but just cause it was pretty. I don’t know anything about the elements. I would lose in that category on Jeopardy.