Technical data for Fluorine

Overview
NameFluorine
SymbolF
Atomic Number9
Atomic Weight18.9984032
Density1.696 g/l[note]
Melting Point-219.6 °C
Boiling Point-188.12 °C

Thermal properties
PhaseGas
Melting Point-219.6 °C
Boiling Point-188.12 °C
Absolute Melting Point53.5 K
Absolute Boiling Point85.03 K
Critical Presure5.172 MPa (51.04 Atm)
Critical Temperature144.13 K
Heat of Fusion0.26 kJ/mol
Heat of Vaporization3.27 kJ/mol
Heat of CombustionN/A
Specific Heat824 J/(kg K)[note]
Adiabatic Index7/5
Thermal Conductivity0.0277 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density1.696 g/l[note]
Density (Liquid)N/A
Molar Volume0.011202
Refractive Index1.000195
Speed of SoundN/A
Thermal Conductivity0.0277 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence1
Electronegativity3.98
ElectronAffinity328 kJ/mol
Ionization Energies
1681, 3374.2, 6050.4, 8407.7, 11022.7, 15164.1, 17868, 92038.1, 106434.3 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A

Classifications
Alternate NamesNone
Nams of AllotropesDifluorine
Blockp
Group17
Period2
Electron Configuration[He]2s22p5
ColorColorless
Discovery
1886 in France
Gas phaseDiatomic
CAS NumberCAS7782-41-4

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in Universe0.00004%
% in Sun0.00005%
% in Meteorites0.0087%
% in Earth's Crust0.054%
% in Oceans0.00013%
% in Humans0.0037%

Atomic dimensions and structure
Atomic Radius42 pm
Covalent Radius71 pm
Van der Waals Radius147 pm
Crystal StructureBase Centered Monoclinic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
550, 328, 728 pm
Space Group NameC12/c1
Space Group Number15

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
19F
Isotopic Abundances
19F100%

Notes on the properties of Fluorine:
Density: Density given for F at 0° Celsius. 2
Specific Heat: Value given for gas phase of F . 2