A repository for sharing periodic table information and Waber-Cromer radii of the elements
W-C radii come from http://dx.doi.org/10.1063/1.1695904 via Prasanna Balachandran of LANL. Periodic table information taken from Rchemcpp repository (https://github.com/Bioconductor-mirror/Rchemcpp), Webelements, and Wikipedia.