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Fluorine,  9F
Template:Infobox element/symbol-to-top-image/alt
Liquid fluorine (at extremely low temperatures)
General properties
Pronunciation
Allotropesalpha, beta
Appearancegas: very pale yellow
liquid: bright yellow
solid: alpha is opaque, beta is transparent
Standard atomic weight (Ar, standard)18.998403163(6)
Fluorine in the periodic table
HydrogenHelium
LithiumBerylliumBoronCarbonNitrogenOxygenFluorineNeon
SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon
PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromineKrypton
RubidiumStrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodineXenon
CaesiumBariumLanthanumCeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercury (element)ThalliumLeadBismuthPoloniumAstatineRadon
FranciumRadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessineOganesson


F

Cl
oxygenfluorineneon
Atomic number (Z)9
Groupgroup 17 (halogens)
Periodperiod 2
Blockp-block
Element category  reactive nonmetal
Electron configuration[He] 2s2 2p5
Electrons per shell
2, 7
Physical properties
Phase at STPF: Gas
Melting point53.48 K ​(−219.67 °C, ​−363.41 °F)
Boiling point85.03 K ​(−188.11 °C, ​−306.60 °F)
Density (at STP)1.696 g/L
when liquid (at b.p.)1.505 g/cm3
Triple point53.48 K, ​90 kPa
Critical point144.41 K, 5.1724 MPa
Heat of vaporization6.51 kJ/mol
Molar heat capacityCp: 31 J/(mol·K) (at 21.1 °C)
C: 23 J/(mol·K) (at 21.1 °C)
Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)384450586985
Atomic properties
Oxidation states−1 (oxidizes oxygen)
ElectronegativityPauling scale: 3.98
Ionization energies
  • 1st: 1681 kJ/mol
  • 2nd: 3374 kJ/mol
  • 3rd: 6147 kJ/mol
  • (more)
Covalent radius64 pm
Van der Waals radius135 pm
Color lines in a spectral range
Spectral lines of fluorine
Other properties
Natural occurrenceF: Primordial
Crystal structurecubic
Cubic crystal structure for fluorine
Thermal conductivity0.02591 W/(m·K)
Magnetic orderingdiamagnetic (−1.2×10−4)
CAS Number7782-41-4
History
Namingafter the mineral fluorite, itself named after Latin fluo (to flow, in smelting)
DiscoveryAndré-Marie Ampère (1810)
First isolationHenri Moissan (June 26, 1886)
Named byHumphry Davy
Main isotopes of fluorine
Iso­topeAbun­danceHalf-life (1/2)Decay modePro­duct
18Ftrace109.8 minβ+ (97%)18O
ε (3%)18O
19F100%stable
| references
A more real picture of fluorine

Fluorine (symbol F) is a chemical element that is very poisonous. Its atomic number (which is the number of protons in it) is 9, and its atomic mass is 19. It is part of the Group 7 (halogens) on the periodic table of elements.

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   Related Content
    • fluorine element
    • fluorine in water
    • fluorine on the periodic table
    • fluorine pictures
    • fluorine b
    • fluorine non metal


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