Assertion: astatine | /r/HasAspect | stable isotopes
Facets:
Source sentences:
text: Astatine and the elements on either side of it, polonium and radon , have no stable isotopes.
text: Additionally, astatine has no stable isotopes.
text: Astatine is a chemical element that has no stable isotopes (it is radioactive).
text: Additionally, astatine has no stable isotopes;
text: Astatine is a halogen which has no stable isotopes.
text: Astatine is the rarest naturally occurring element, and has no stable isotopes: the longest-lived has a half-life of just 8.1 hours.