Assertion: technetium | /r/HasProperty | the lightest element
Facets:
value: with no stable isotopes
type: OTHER
Source sentences:
text: Technetium is the lightest element whose isotopes are all radioactive; none are stable.
text: Technetium is the lightest element whose isotopes are all radioactive; none are stable.
text: Technetium is the lightest element whose isotopes are all radioactive.
text: Technetium is the lightest element with no stable isotopes and is found in vanishingly small quantities in nature (as a natural byproduct of uranium fission - with an estimated 1 nanogram per kilogram of uranium).