Assertion: chlorine's compound | /r/HasProperty | known since ancient times
Facets:
Source sentences:
text: The most common compound of chlorine, sodium chloride (common salt), has been known since ancient times.
text: The most common compound of chlorine, sodium chloride, has been known since ancient times; archaeologists have found evidence that rock salt was used as early as 3000 BC and brine as early as 6000 BC.
text: The most common compound of chlorine, sodium chloride, has been known since ancient times.