. . . "protoactinium"@en-us . . . "a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead"@en-us . . "Pa"@en-us . . . . . . . "110498490"@en-us . . . "protactinium"@en-us . . . . . . "atomic number 91"@en-us . "114651708"^^ . . . "14651708-n"^^ . "113813000"@en-us . "protactinium"^^ . . . . "0"^^ . "0"^^ . . .