• protoactinium /ˌprəʊtəʊækˈtɪnɪəm/

  • 1

    →the former name ofprotactinium

protoactinium

• n.
  • 1

    a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

    同义词： protactinium / Pa / atomic number 91

• 镤

  • 镤

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