Assertion: hydrogen fluoride's fluorine | /r/HasAspect | melting point of -219.62°c
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Source sentences:
text: Fluorine has a melting point of -219.62°C (1 atm), boiling point of -188.14°C (1 atm), density of 1.696 g/l (0°C, 1 atm), specific gravity of liquid of 1.108 at its boiling point, and valence of 1.