Discovery of Protactinium
Protactinium, atomic number 91, has a mass of 231.036 au.
Radioactive element: Pa is only found in tiny amounts in nature. Most samples are synthetic.
Protactinium was first observed or predicted in 1913 by O. H. Göhring and K. Fajans and first isolated in 1927 by A. von Grosse.
|Periodic Table, What is it showing?||
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