protactinium

Protactinium, element 91, was discovered in 1918 by German chemist Otto Hahn and physicist Lise Meitner. They initially dubbed the element proactinium because the element’s radioactive decay converts protactinium into actinium, therefore it “comes before” (pro-) actinium. Shortly after this initial naming, the pair inserted the t to make the name easier to pronounce and it became protactinium.

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