Assertion: plutonium's isotope | /r/HasProperty | common
Facets:
Source sentences:
text: Plutonium has five "common" isotopes, Pu-238, Pu-239, Pu-240, Pu-241, and Pu-242.
text: Plutonium has five “common” isotopes, Pu-238, Pu-239, Pu-240, Pu-241, and Pu-242.