Assertion: protactinium | /r/HasProperty | shrouded in mystery and witchcraft
Facets:
value: for the next several decades
type: TEMPORAL
value: due to its perplexing chemical properties
type: CAUSE
value: due to its scarcity in nature
type: CAUSE
Source sentences:
text: For the next several decades, protactinium was shrouded in “mystery and witchcraft” due to its scarcity in nature and its perplexing chemical properties.