Assertion: protactinium | /r/HasProperty | metal
Facets:
value: with silvery-gray luster
type: OTHER
Source sentences:
text: Protactinium is a metal with silvery-gray luster that is preserved for some time in air.
text: Protactinium is a metal with silvery-gray luster that is preserved for some time in air.
text: Protactinium is a metal with silvery-gray luster that is preserved for some time in air.   
text: Protactinium is a metal with silvery-gray luster that is preserved for some time in air.