Assertion: bohrium's isotope | /r/HasProperty | predicted by mendeleev
Facets:
value: in 1871
type: TEMPORAL
Source sentences:
text: The two obtained the first isotope of this element that had been predicted by Mendeleev in 1871 as a member of the natural decay of 238U. Originally isolated in 1900 by William Crookes, who nevertheless did not recognize that it was a new element.