Check the listing for details. Roentgenium Element Cube. Condition: New. Listed at 53.55 USD. Roentgenium Element Cube Made In USA 2x2x2 inches Radioactive symbol. No sample. Roentgenium's atomic number is 111 and its symbol is Rg. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a half-life of 100 seconds. It is named after the physicist Wilhelm Röntgen (also spelled Roentgen), who also discovered X-rays. Only a few roentgenium atoms have ever been synthesized, and they contain no current practical application beyond that of scientific study. This display is contained within crystal clear lucite acrylic. Made In USA 2x2x2 inches Radioactive symbol. No sample. Roentgenium's atomic number is 111 and its symbol is Rg. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a half-life of 100 seconds. It is named after the physicist Wilhelm Röntgen (also spelled Roentgen), who also discovered X-rays. Only a few roentgenium atoms have ever been synthesized, and they contain no current practical application beyond that of scientific study. This display is contained within crystal clear lucite acrylic.eBay integration by