Assertion: neptunium's isotope | /r/HasProperty | recognized
Facets:
Source sentences:
text: Seventeen isotopes of neptunium are now recognized.
text: Seventeen isotopes of neptunium are now recognized.
text: Isotopes Fifteen isotopes of neptunium are now recognized.
text: Twenty isotopes and isomers of neptunium are now recognized.
text: Fifteen isotopes of neptunium are now recognized.