Useful and interesting projects by other people:

Title: Link:
Periodic table in WebGL https://threejs.org/examples/css3d_periodictable.html
Example:
Periodic table in Flash (English) http://touchspin.touchspin.com/
Example:
Periodic table in Flash (Russian) http://www.naexamen.ru/mend/index.shtml
Example:
Periodic table (interactive pdf) http://ptable.com/
Example: