Assertion: fluorine's form | /r/HasProperty | pure
Facets:
Source sentences:
text: Fluorine is rarely found in its pure form.
text: Fluorine is is poisonous gas and pure form in air can last transiently and react instantly with most substances.
text: Fluorine the element is a noxious pale yellow gas that is rarely used in its pure form however its main use is in uranium enrichment for nuclear reactors – a process developed during the Manhattan Project.