External links to similar and supplementary information:
Extensive data about chemical elements
(chemistry, mechanical and thermal properties,
nuclear magnetic moments, etc. etc.) can be found at:
http://www.webelements.com
xray absorption and other optical data for 30 eV to 30 keV:
http://www-cxro.lbl.gov/optical_constants/
A fantastic resource by the author of Mathematica:
Wooden periodic table table