Assertion: rutherfordium's isotope | /r/HasProperty | known with mass numbers
Facets:
value: between 290 and 293 inclusive
type: OTHER
Source sentences:
text: Four isotopes of livermorium are known, with mass numbers between 290 and 293 inclusive; the longest-lived among them is livermorium-293 with a half-life of about 60 milliseconds.