Assertion: cerium | /r/HasProperty | exposed to air
Facets:
Source sentences:
text: Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife.
text: Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife.
text: Cerium is tarnished when exposed to air.
text: Cerium is a silvery grey lustrous metal that is malleable—it is soft enough to be cut with a knife, and tarnishes when exposed to air.
text: Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife.