Periodic System of t he Chemical Elements
An accessible, extensible, interactive, and free Periodic Table.
This is a system that can predict what the periodic table of the chemical elements would look like for elements that are not yet created or discovered, or can even be considered remotely reasonable (at least under “normal” conditions). By extrapolating known visual representations, one might gain new perspectives on the realm of theoretical elements, electron configurations, or flaws in the system (some theories actually predict different outcomes).