Chemical Elements History and Information Protactinium
About the chemical element Protactinium, its symbol, atomic number and weight, who discovered it and when.
The Atomic Elements and Their Uses
(Element) (Symbol) (Atomic number) (Atomic weight)
Protactinium Pa 91 231.0359
Isolated by Otto Hahn and Lise Meitner of Germany in 1917. Independently isolated by Frederick Soddy and John Cranston of England in 1918.
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