Assertion: astatine's isotope | /r/HasProperty | radioactive
Facets:
value: with quite short half-lives
type: OTHER
Source sentences:
text: The scientists found that the isotope they created was radioactive, so they named the element using the Greek ‘astatos’ meaning unstable.
text: All isotopes of astatine are radioactive and decay into other elements.
text: However, for a naturally-occurring element it is very rare, and all its isotopes are radioactive with half-lives of hours or less.
text: All isotopes of astatine are radioactive with quite short half-lives (the longest-lived isotope has a half-life of only about 8 hours), so it's found in nature only in extremely minute amounts (at any given time there is probably less than an ounce of astatine in all of Earth's crust) as a decay product of other radioactive elements.
text: All the isotopes of astatine are radioactive and has very short half lives; consequently is a dangerous element.
text: All 20 isotopes of astatine are radioactive.
text: As it is unstable, all isotopes of polonium are radioactive.