Assertion: astatine | /r/HasProperty | known halogen
Facets:
value: heaviest
type: DEGREE
value: according to lenntech
type: OTHER
Source sentences:
text: According to Lenntech, astatine is the heaviest known halogen.
text: Astatine is the heaviest known halogen
text: Astatine is the heaviest known halogen
text: Astatine is the heaviest known halogen (Group 17 of the periodic table ).