Assertion: astatine's property | /r/HasProperty | measured
Facets:
value: directly
type: MANNER
Source sentences:
text: Except for nuclear properties, the only physical property of astatine to be measured directly is the spectrum of atomic astatine.
text: No properties of tennessine or its compounds have been measured; this is due to its extremely limited and expensive production and the fact that it decays very quickly.