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Name Fluorine
Atomic Number 9
Atomic Weight 18.9984
Symbol F
Melting Point ( °C ) -220
Boiling Point ( °C ) -188
Density (g/cm3) 1.7
Earth crust (%) 0.029
Discovery (Year) 1886
Group 17
Electron configuration [He] 2s2 2p5
Ionization energy (eV) 17.4228

Fluorine is a halogen. Fluorine is the most reactive of all the elements.

No chemical substance is capable of freeing Fluorine from any of its compounds

1670 was the first year of it being recorded of being used.

Fluorine is added to city water to help prevent tooth decay.

Sodium fluoride (NaF), stannous(II) fluoride (SnF2) and sodium monofluorophosphate (Na2PO3F) are all fluorine compounds added to toothpaste, also to help prevent tooth decay.

Was widey used in air conditioning and refrigeration systems and in aerosol cans, but damages to the earths ozone layer made them use less of it.

Appearance Pale yellow green

Uses Fluoride salts are used in welding, and frost glass.Was used in world war II for the atom bomb.Now banned they have been replaced by hydro-fluorocarbons.

It is an essential ion for animals, to strengthen teeth and bones.

Resources http://education.jlab.org/itselemental/ele009.html http://www.rsc.org/periodic-table/element/9/fluorine

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