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It takes some time to load this applet. Please, be patient. Eventually, the elements will appear in the empty area. The Double-Shell Periodic System Click on an element for a table of all properties of this element Click on a property of the list to see a graph of this property for all elements Your browser does not support Java applets. If you click on a property from the list of properties, a chart displays the selected property for each halve of the double shells in a different color.