Protactinium (formerly protoactinium, Pa) is a chemical element with atomic number (Z) 91, group n/a, period 7, and atomic weight 231.036. The Protactinium (Pa) is a silver metallic element that is malleable, shiny, silver-gray, radioactive. Protactinium is high radioactivity and toxicity, no uses outside of basic scientific research. (Refer to the Chemical Element; Periodic Table)
Protactinium (formerly protoactinium, Pa)
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