Assertion: berkelium's property | /r/HasProperty | studied
Facets:
value: rarely
type: DEGREE
value: extensively
type: DEGREE
Source sentences:
text: It is the only berkelium isotope available in bulk quantities, and thus the only berkelium isotope whose properties can be extensively studied.
text: Although berkelium was first synthesized over 60 years ago, its isotope is produced in such small amounts and remains stable for such a short time (less than a year) that its fundamental structure and properties are rarely studied.