Assertion: fluorine's number | /r/HasProperty | atomic weight
Facets:
Source sentences:
text: Atomic number 9; atomic weight 18.9984; melting point -223
text: Its chemical symbol is F and its atomic number is nine.
text: Atomic Number: 9 Atomic Symbol: F Atomic Weight:
text: Atomic number, 9; atomic weight, 18.998403.
text: Atomic number, 9; atomic weight, 18.998403.