Assertion: protactinium | /r/CapableOf | tarnish in air
Facets:
value: slowly
type: MANNER
value: to the oxide
type: LOCATION
Source sentences:
text: Protactinium has bright metallic lustre and tarnishes slowly in air.
text: Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide.