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Americium is a radioactive and synthetic element in the periodic table. It does not occur naturally and is produced by scientists in laboratories. Discovery and Name Americium was discovered in 1944. It is named after the continent of America, in honor of its origin and the place of its discovery. Properties Americium is a metallic element and is radioactive. It has a soft, silvery appearance but cannot remain stable in air for long periods. It does not occur naturally outside laboratories. Appl