Assertion: berkelium's isotope | /r/HasAspect | a mass of 243
Facets:
Source sentences:
text: The first isotope produced had a mass of 243 and decayed with a half-life of 4.5 hours.
text: The first isotope produced had a mass of 243 and decayed with a half-life of 4.5 hours.
text: The first isotope produced had a mass of 243 and decayed with a half-life of 4.5 hours.
text: The first isotope produced had a mass of 243 and decayed with a half-life of 4.5 hours.