Assertion: protactinium's isotope | /r/HasProperty | studied by otto hahn
Facets:
value: in germany
type: LOCATION
value: independently
type: MANNER
Source sentences:
text: The existence of protactinium was confirmed in 1918 when another isotope of protactinium (of mass 231 and a half-life of 3.3 × 104 years) was studied independently by Otto Hahn and Lise Meitner in Germany, and by Frederick Soddy and John Cranston in Great Britain.