Assertion: hafnium's isotope | /r/HasProperty | many natural and artificial
Facets:
Source sentences:
text: Hafnium has many natural and artificial isotopes, each with a different number of neutrons.
text: Hafnium has many natural and artificial isotopes, each with a different number of neutrons.
text: Hafnium has many natural and artificial isotopes, each with a different number of neutrons.