NO. 009Halogen

F

Fluorine

Fluorine is the most electronegative and reactive element.

Crystal Structure

Orthorhombic

Atomic Mass18.998 u

Density0.001696 g/cm³

Melting Point53.48 K

Boiling Point85.03 K

Atomic Radius42 pm

Electronegativity3.98

Ionization Energy1681 kJ/mol

Electron Affinity328 kJ/mol

Bonding TypeCovalent

Oxidation States-1

Acid/BaseAcidic

ReactivityHigh

Electron Configuration

[He] 2s2 2p5

Discovered ByHenri Moissan

Year1886

Known Isotopes

Fluorine-19