Assertion: chlorine dioxide's chlorine | /r/HasProperty | isolated as free element
Facets:
Source sentences:
text: When isolated as a free element, chlorine takes the form of a greenish-yellow gas, which is 2.5 times heavier than air and smells like bleach.
text: When chlorine is isolated as a free element, it is a greenish yellow gas, which is 2.5 times heavier than air.