Name :  Fluorine
Symbol :  F
Atomic Number :  9
Atomic Weight :  18.9984032
Specific Heat :  0.82 J/gK
Melting Point :  -219.62°C
Vaporization :  3.2698 kJ/mol
Boiling Point :  -188.14°C
Electronegativity :  3.98
Density@293 K :  0.001696 g/cm³
Discovered :  Henri Moissan, France, 1886
Description :  Greenish-yellow, pungent, corrosive gas. Extremely reactive. Does not occur uncombined in nature.
Uses :  Used in refrigerants and other fluorocarbons. Also in toothpaste as sodium fluoride (NaF) and stannous fluoride (SnF2) also in Teflon.