Assertion: rutherfordium's isotope | /r/HasProperty | synthesized
Facets:
Source sentences:
text: The first isotope to be synthesized was either 259Rf in 1966 or 257Rf in 1969.
text: The first isotope to be synthesized was either 259Rf in 1966 or 257Rf in 1969.
text: The first isotope to be synthesized was either 259Rf in 1966 or 257Rf in 1969.
text: The first isotope to be synthesized was 265Hs in 1984.
text: The first isotope to be synthesized was 289Fl in 1999.