Protactinium (pronounced /ˌproʊtækˈtɪniəm/, PROH-tak-TIN-ee-əm) is a chemical ... Protactinium-231 is formed by the alpha decay of U-235 followed by beta decay of ...
Basic information and history. ... The name protoactinium was shortened to protactinium in 1949. ... Protactinium has a bright metallic luster which it retains ...