Assertion: protactinium's isotope | /r/HasProperty | isolated
Facets:
Source sentences:
text: They gave the new element the name Brevium (Latin brevis, brief, short); because of the short life-time of the transition between Th-234 and U-234, a longer-lived isotope was eventually isolated and the name was changed to Protoactinium in 1918 when two groups of scientists (Otto Hahn and Lise Meitner of Germany and Frederick Soddy and John Cranston of the UK) independently discovered 231-Pa, and shortened to Protactinium in 1949.