Assertion: protactinium | /r/PartOf | the actinide group
Facets:
value: with a bright metallic luster
type: OTHER
Source sentences:
text: Protactinium is a silver metallic element that belongs to the actinide group, with a bright metallic luster that it retains for some time in the air.
text: Protactinium is a silver metallic element that belongs to the actinide group, with a bright metallic luster that it retains for some time in the air.
text: Protactinium belongs to the actinide group, with a bright metallic luster that it retains for some time in the air.