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.