Assertion: astatine | /r/HasProperty | unstable
Facets:
value: highly
type: DEGREE
value: as at−
type: OTHER
value: in truth
type: OTHER
value: in its elemental form
type: OTHER
Source sentences:
text: Astatine is usually placed with the metalloids or the nonmetals by different authors based on its position in periodic table, but in truth, astatine is so unstable in its elemental form, we have no idea which one it is.
text: It is radioactive and extremely unstable, with a half-life of around eight hours.
text: Astatine is the rarest element on Earth, and it is also highly unstable and radioactive.
text: (Astatine goes further, being indeed unstable as At− and readily oxidised to At0 or At+, although the existence of At 2 is not settled.)