Assertion: protactinium's isotope | /r/HasAspect | short half-life
Facets:
value: very
type: DEGREE
Source sentences:
text: They called the element ‘brevium’ because the isotope they had found (protactinium-234) has a very short half-life (1.17 minutes).
text: As the first isotope of neptunium to be discovered has such a short half-life, McMillan and Abelson were unable to prepare a sample that was large enough to perform chemical analysis of the new element using the technology that was then available.