Check the listing for details. Americium Element Cube. Condition: New. Listed at 53.55 USD. Americium Element Cube Made In USA 2x2x2 inches Radioactive symbol. No sample. Americium's atomic number is 95 and its symbol is Am. It is a radioactive, soft, silver-white, heavy metal that is denser than lead and slowly tarnishes in air. With a density of about 13.6 g/cc, it is almost twice as heavy as steel. The researchers at first referred to americium as "pandemonium" owing to the difficulties they encountered trying to isolate it from another new element with which it was very closely associated, curium - or "delirium" as it was first called. In the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. This display is contained within crystal clear lucite acrylic. Made In USA 2x2x2 inches Radioactive symbol. No sample. Americium's atomic number is 95 and its symbol is Am. It is a radioactive, soft, silver-white, heavy metal that is denser than lead and slowly tarnishes in air. With a density of about 13.6 g/cc, it is almost twice as heavy as steel. The researchers at first referred to americium as "pandemonium" owing to the difficulties they encountered trying to isolate it from another new element with which it was very closely associated, curium - or "delirium" as it was first called. In the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. This display is contained within crystal clear lucite acrylic. eBay integration by