Assertion: actinium | /r/HasProperty | discovered by andre debierne
Facets:
value: by f. giesel
type: OTHER
value: in 1902
type: TEMPORAL
value: in 1899
type: TEMPORAL
Source sentences:
text: Actinium was discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902, both of whom obtained it while working on separation techniques for rare earth oxides.