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The ChemCollective: Periodic Table Applet
A reference and instruction for scientists of all levels.
What chemistry software package would be complete without a periodic table?
The actual use of this applet in the classroom is quite simple. Simply click on the desired element and data as well as a graphical plot of electron configurations will be displayed. This particular version shows the electronic configuration of the element in the panel on the right. Future versions of this applet will show relative atomic sizes, electronegativities and other periodic trends, as well as extensive atomic data.