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Fluorine

From Simple English Wikipedia, the free encyclopedia
Fluorine, 00F
Small sample of pale yellow liquid fluorine condensed in liquid nitrogen
Liquid fluorine (atextremely low temperatures)
Fluorine
Pronunciation
Allotropesalpha, beta (seeAllotropes of fluorine)
Appearancegas: very pale yellow
liquid: bright yellow
solid: alpha is opaque, beta is transparent
Standard atomic weightAr°(F)
18.998403163(6)[1]
Fluorine in theperiodic table
HydrogenHelium
LithiumBerylliumBoronCarbonNitrogenOxygenFluorineNeon
SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon
PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromineKrypton
RubidiumStrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodineXenon
CaesiumBariumLanthanumCeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercury (element)ThalliumLeadBismuthPoloniumAstatineRadon
FranciumRadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessineOganesson


F

Cl
oxygenfluorineneon
Groupgroup 17 (halogens)
Periodperiod 2
Block p-block
Electron configuration[He] 2s2 2p5[2]
Electrons per shell2, 7
Physical properties
Phaseat STPgas
Melting point53.48 K(219.67 °C,363.41 °F)[3]
Boiling point85.03 K(188.11 °C,306.60 °F)[3]
Density(at STP)1.696 g/L[4]
when liquid (at b.p.)1.505 g/cm3[5]
Triple point53.48 K,90 kPa[3]
Critical point144.41 K, 5.1724 MPa[3]
Heat of vaporization6.51 kJ/mol[4]
Molar heat capacityCp: 31 J/(mol·K)[5](at 21.1 °C)
Cv: 23 J/(mol·K)[5](at 21.1 °C)
Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)384450586985
Atomic properties
Oxidation states−1, 0[6] (oxidizes oxygen)
ElectronegativityPauling scale: 3.98[2]
Ionization energies
  • 1st: 1681 kJ/mol
  • 2nd: 3374 kJ/mol
  • 3rd: 6147 kJ/mol
  • (more)[7]
Covalent radius64 pm[8]
Van der Waals radius135 pm[9]
Color lines in a spectral range
Spectral lines of fluorine
Other properties
Natural occurrenceprimordial
Crystal structurecubic
Cubic crystal structure for fluorine
Thermal conductivity0.02591 W/(m⋅K)[10]
Magnetic orderingdiamagnetic (−1.2×10−4)[11][12]
CAS Number7782-41-4[2]
History
Namingafter the mineralfluorite, itself named after Latinfluo (to flow, in smelting)
DiscoveryAndré-Marie Ampère(1810)
First isolationHenri Moissan[2](June 26, 1886)
Named byHumphry Davy
Isotopes of fluorine
Main isotopesDecay
abun­dancehalf-life(t1/2)modepro­duct
18Ftrace109.734 minβ+18O
19F100%stable
 Category: Fluorine
|references
A more real picture of fluorine

Fluorine (symbolF) is achemical element that is very poisonous. Itsatomic number (which is the number ofprotons in it) is 9, and itsatomic mass is 19. It is part of the Group 7 (halogens) on theperiodic table of elements.

Properties

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Fluorine is a light yellow diatomic gas. It is very reactive gas, which exists as diatomic molecules. It is the most reactive element. Fluorine has a very high attraction for electrons because it is missing one. This makes it the most powerfuloxidizing agent. It can rip electrons from water (makingoxygen) and ignitepropane on contact. It does not need a spark. Metals can catch on fire when placed in a stream of fluorine. After it isreduced by reacting with other things, it forms the stablefluoride ion. Fluorine is very poisonous. Fluorine bonds very strongly withcarbon. It can react with the unreactivenoble gases. It explodes when mixed withhydrogen. The melting point of fluorine is -363.33°F (-219.62°C), the boiling point is -306.62°F (-188.12°C).

Chemical compounds

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Chemical compounds containing fluorineions are calledfluorides. Fluorine only exists in oneoxidation state: -1.

Occurrence

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Fluoritecrystals, the "ore" of fluorine

Fluorine is not found as an element on the earth becase it is too reactive. Several fluorides are found in the earth, though. Whencalcium phosphate is reacted withsulfuric acid to makephosphoric acid, somehydrofluoric acid is produced. Also,fluorite can be reacted with sulfuric acid to make hydrofluoric acid. Fluorite naturally occurs on the earths' crust in rocks, coal and clay.

Preparation

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Fluorine is normally made byelectrolysis.Hydrogen fluoride is dissolved inpotassium fluoride. This mixture is melted and an electric current is passed through it. This is electrolysis. Hydrogen is produced at one side and fluorine at the other side. If the sides are not separated, the cell may explode.

Someone made fluorine in 1986 without using electrolysis. They producedmanganese(IV) fluoride by using various chemical compounds, which released fluorine gas.

Uses

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Fluorine is used to enrich uranium fornuclear weapons. It is also used to makesulfur hexafluoride. Sulfur hexafluoride is used to propel stuff out of an aerosol can. It is also used to makeintegrated circuits. Fluorine compounds have many uses.Fluoride ions are in fluorine compounds. Fluoride ions can be intoothpaste. Some are used innonstick coatings.Freons contain fluorine.

Safety

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Fluorine as an element is extremely reactive and toxic. It can react with almost everything, even glass. Fluorine is also poisonous.

Fluoride ions are somewhat toxic. If too much toothpaste containing fluoride is eaten then fluoride poisoning may occur. Fluoride is not reactive, though.

Related pages

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Sources

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  1. "Standard Atomic Weights: Fluorine".CIAAW. 2013.
  2. 1234Jaccaud et al. 2000, p. 381. sfn error: no target: CITEREFJaccaud_et_al.2000 (help)
  3. 1234Haynes 2011, p. 4.121. sfn error: no target: CITEREFHaynes2011 (help)
  4. 12Jaccaud et al. 2000, p. 382. sfn error: no target: CITEREFJaccaud_et_al.2000 (help)
  5. 123Compressed Gas Association 1999, p. 365. sfn error: no target: CITEREFCompressed_Gas_Association1999 (help)
  6. Himmel, D.; Riedel, S. (2007). "After 20 Years, Theoretical Evidence That 'AuF7' Is Actually AuF5·F2".Inorganic Chemistry.46 (13). 5338–5342.doi:10.1021/ic700431s.
  7. Dean 1999, p. 4.6. sfn error: no target: CITEREFDean1999 (help)
  8. Dean 1999, p. 4.35. sfn error: no target: CITEREFDean1999 (help)
  9. Matsui 2006, p. 257. sfn error: no target: CITEREFMatsui2006 (help)
  10. Yaws& Braker 2001, p. 385. sfn error: no target: CITEREFYawsBraker2001 (help)
  11. Mackay, Mackay& Henderson 2002, p. 72. sfn error: no target: CITEREFMackayMackayHenderson2002 (help)
  12. Cheng et al. 1999. sfn error: no target: CITEREFCheng_et_al.1999 (help)
  13. Chisté& Bé 2011. sfn error: no target: CITEREFChistéBé2011 (help)
H He
LiBe BCNOFNe
NaMg AlSiPSClAr
KCa ScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSr YZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg
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