Fluorine
Chemical properties:
Atomic Number: 84
Atomic Weight: 209
Melting Point: 527 K (254°C or 489°F)
Boiling Point: 1235 K (962°C or 1764°F)
Density: 9.32 grams per cubic centimeter
The most reactive element!
Physical Properties:
pale yellow gas
Specific heat :0.82J/gK
