protactinium

prot ac tin i um |ˌprōˌtakˈtinēəm ˌproʊˌtækˈtiniəm | ▶noun the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium. (Symbol: Pa ) ORIGIN early 20th cent.: from proto- ‘original, earlier ’ + actinium, so named because one of its isotopes decays to form actinium.

protactinium

protactinium |ˌprəʊtakˈtɪnɪəm | ▶noun [ mass noun ] the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium. (Symbol: Pa ) ORIGIN early 20th cent.: from proto- ‘original, earlier ’ + actinium, so named because one of its isotopes decays to form actinium.

Protactinium

Pro t ac ti ni um , Pro tac ti ni um Substantiv, Neutrum Chemie , das |Protact i nium |zu griechisch prõtos = erster und Actinium beim natürlichen Zerfall von Uran entstehendes radioaktives Metall chemisches Element Pa