Fluorine - F
Atomic Number 9 Atomic Mass 18.99840322 State gas
Color light yellow Electronegativity 3.98 Melting Point -219.62°C
Boiling Point -188.14°C Natural Isotope F-19 100%
Abbreviated Electron Configuration [He] 2s2 2p5
Discovered by Henri Moissan in 1886.