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A 231Pa reference material has been characterized for amount of protactinium.
2
Scuffles soon arose over who'd first bagged hafnium, protactinium, and technetium.
3
This addition of a proton shifts it to the next element on the table, protactinium-233.
4
They rechristened it protactinium, or "parent of actinium," the element into which it (eventually) decayed.
5
This is also unstable, so the protactinium spits out another electron and transforms into what you started with, uranium-233.
6
Furthermore, figuring out how to extract unwanted elements produced as thorium decays-suchas protactinium-233-fromthefuel remains a major technical challenge.
7
In 1897, the newly knighted Sir William dove into radioactivity, even discovering (though without realizing it) the element protactinium in 1900.