General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Fluorine Symbol F
atomic number 9 Atomic weight 18.998403
Density @ 293 K 0.001696 g/cm3 Atomic volume 17.1 cm3/mol
Group Halogen discovered 1886


state (s, l, g) g
melting point 53.58 K boiling point 85.1 K
Heat of fusion 0.2552 kJ/mol Heat of vaporization 3.2698 kJ/mol
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1st ionization energy 1681 kJ/mole electronegativity 3.98
2nd ionization energy 3374.1 kJ/mole electron affinity 328 kJ/mole
3rd ionization energy 6050.3 kJ/mole Specific heat 0.82 J/gK
heat atomization 79 kJ/mole atoms

Oxidation & Electrons

Shells 2,7 electron configuration [He] 2s2 2p5
minimum oxidation number -1 maximum oxidation number 0
min. common oxidation no. -1 max. common oxidation no. 0
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Appearance & Characteristics

structure layers of F2 color colorless
uses fluorocarbons, toothpaste toxicity yes
hardness mohs characteristics diatomic(F2), corrosive


reaction with air none reaction with 6M HCl vigorous, = HF, OF2, ClF3
reaction with 6M HCl vigorous, = HF, OF2, ClF3 reaction with 15M HNO3
reaction with 6M NaOH vigorous, = O2, NaF
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Other Forms

number of isotopes 1 hydride(s) HF
oxide(s) OF2 chloride(s) ClF ClF3 ClF5


ionic radius (2- ion) pm ionic radius (1- ion) 119 pm
atomic radius 72 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity 0.03 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 0.634 A^3


source Fluorite (misc) rel. abund. solar system 2.926 log
abundance earth's crust 2.8 log cost, pure 190 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.