Assertion: astatine | /r/HasAspect | short-lived isotopes
Facets:
Source sentences:
text: Astatine is - besides radon and francium - the only natural radioelement which only has short-Lived isotopes, thereby excluding experiments with . .
text: Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group.