Assertion: hafnium's isotope | /r/HasProperty | mass
Facets:
Source sentences:
text: The thinking finally emerged that Hafnium was an element needing somewhat parallel treatment with other rather unremarkable elements, but the nucleus and its excitation of one of its isotopes (mass 178) gave the element a notability that needed to be remarked, but the explication could be made in adequate detail only in a separate page at Induced gamma emission(IGE).