Assertion: astatine | /r/HasAspect | 33 known isotopes
Facets:
Source sentences:
text: Astatine has 33 known isotopes, all of which are radioactive; the range of their mass numbers is from 191 to 223.
text: Astatine has 33 known isotopes, all of which are radioactive; the range of their mass numbers is from 191 to 223.