From Wikipedia, the free encyclopedia
U Protoattiniu (simbulu Pa) hè u 91imu elementu chimicu. A so massa atomica hè 231,0359 g/mol è a so densità hè 15,37 g/cm3 . U Protoattiniu hè statu scupertu in u 1917 da Soddy, Cranston è Hahn.
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