Technical data for Fluorine

Overview Name Fluorine Symbol F Atomic Number 9 Atomic Weight 18.998403163 Density 1.696 g/l[note] Melting Point -219.6 °C Boiling Point -188.12 °C Thermal properties Phase Gas Melting Point -219.6 °C Boiling Point -188.12 °C Absolute Melting Point 53.5 K Absolute Boiling Point 85.03 K Critical Pressure 5.172 MPa (51.04 Atm) Critical Temperature 144.13 K Heat of Fusion 0.26 kJ/mol Heat of Vaporization 3.27 kJ/mol Specific Heat 824 J/(kg K)[note] Adiabatic Index 7/5 Neel Point N/A Thermal Conductivity 0.0277 W/(m K) Thermal Expansion N/A Bulk physical properties Density 1.696 g/l[note] Density (Liquid) N/A Molar Volume 0.011202 Brinell Hardness N/A Mohs Hardness N/A Vickers Hardness N/A Bulk Modulus N/A Shear Modulus N/A Young Modulus N/A Poisson Ratio N/A Refractive Index 1.000195 Speed of Sound N/A Thermal Conductivity 0.0277 W/(m K) Thermal Expansion N/A Reactivity Valence 1 Electronegativity 3.98 ElectronAffinity 328 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 DOT Hazard Class 2.3 DOT Numbers 9192 RTECS Number RTECSLM6475000 NFPA Label

Classifications Alternate Names None Names of Allotropes Difluorine Block p Group 17 Period 2 Series Halogen Electron Configuration [He]2s22p5 Color Colorless Discovery 1886 in France Gas phase Diatomic CAS Number CAS7782-41-4 CID Number CID24524 RTECS Number RTECSLM6475000 Electrical properties Electrical Type N/A Electrical Conductivity N/A Resistivity N/A Superconducting Point N/A Magnetic properties Magnetic Type N/A Curie Point N/A Mass Magnetic Susceptibility N/A Molar Magnetic Susceptibility N/A Volume Magnetic Susceptibility N/A Abundances % in Universe 0.00004% % in Sun 0.00005% % in Meteorites 0.0087% % in Earth's Crust 0.054% % in Oceans 0.00013% % in Humans 0.0037% Atomic dimensions and structure Atomic Radius 42 pm Covalent Radius 57 pm Van der Waals Radius 147 pm Crystal Structure Base-centered Monoclinic Lattice Angles π/2, π/2, π/2 Lattice Constants 550, 328, 728 pm Space Group Name C12/c1 Space Group Number 15 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 2P3/2 Neutron Cross Section 0.0096 Neutron Mass Absorption 0.00002 Known Isotopes 14F, 15F, 16F, 17F, 18F, 19F, 20F, 21F, 22F, 23F, 24F, 25F, 26F, 27F, 28F, 29F, 30F, 31F Stable Isotopes 19F Isotopic Abundances 19F 100%