CK-12 Foundation
Ck 12: Trends in the Periodic Table
[Free Registration/Login may be required to access all resource tools.] Students investigate specific properties that can be predicted by an element's position on the periodic table. Additionally, they will look at the formation of ions,...
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Chemical Education Digital Library: Periodic Table Live!
By clicking on individuals elements, users can explore a broad range of information about the element, their reactions, their properties, their structures, and their histories.