Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsElectron Configurations and Atomic Radii for the Elementshttp://demonstrations.wolfram.com/ElectronConfigurationsAndAtomicRadiiForTheElements/]]>http://demonstrations.wolfram.com/ElectronConfigurationsAndAtomicRadiiForTheElements/