Chlorine (Cl)

Chlorine facts

Symbol

Cl

Atomic number

17

Atomic mass

35.45

Family

Halogens

Period

3

Group

17

Famous reactions with chlorine

• Snap! You made Hydrogen ChlorideHydrogen chloride H₂ + Cl₂ → 2HCl · In sunlight or bright light · Try it
• Flash! You made table salt!Sodium chloride (table salt) 2Na + Cl₂ → 2NaCl · At room temperature · Try it
• Glittering sparks! Antimony meets ChlorineAntimony trichloride 2Sb + 3Cl₂ → 2SbCl₃ · At room temperature · Try it
• Pool water! Chlorine meets WaterHydrochloric acid + hypochlorous acid (chlorine water) Cl₂ + H₂O → HCl + HClO · At room temperature · Try it

What does chlorine react with?

Chlorine makes a new substance with 84 other elements and chemicals in our lab:

• Chlorine + LithiumLithium chloride 2Li + Cl₂ → 2LiCl · At room temperature · Try it
• Chlorine + BerylliumBeryllium chloride Be + Cl₂ → BeCl₂ · When heated · Try it
• Chlorine + BoronBoron trichloride 2B + 3Cl₂ → 2BCl₃ · When heated · Try it
• Chlorine + FluorineChlorine trifluoride Cl₂ + 3F₂ → 2ClF₃ · When heated · Try it
• Chlorine + MagnesiumMagnesium chloride Mg + Cl₂ → MgCl₂ · At room temperature · Try it
• Chlorine + AluminiumAluminium chloride 2Al + 3Cl₂ → 2AlCl₃ · At room temperature · Try it
• Chlorine + SiliconSilicon tetrachloride Si + 2Cl₂ → SiCl₄ · When heated · Try it
• Chlorine + PhosphorusPhosphorus pentachloride 2P + 5Cl₂ → 2PCl₅ · At room temperature · Try it
• Chlorine + SulfurDisulfur dichloride 2S + Cl₂ → S₂Cl₂ · When heated · Try it
• Chlorine + PotassiumPotassium chloride 2K + Cl₂ → 2KCl · At room temperature · Try it
• Chlorine + CalciumCalcium chloride Ca + Cl₂ → CaCl₂ · At room temperature · Try it
• Chlorine + ScandiumScandium chloride 2Sc + 3Cl₂ → 2ScCl₃ · When heated · Try it
• Chlorine + TitaniumTitanium(IV) chloride Ti + 2Cl₂ → TiCl₄ · When heated · Try it
• Chlorine + VanadiumVanadium(IV) chloride V + 2Cl₂ → VCl₄ · When heated · Try it
• Chlorine + ChromiumChromium(III) chloride 2Cr + 3Cl₂ → 2CrCl₃ · When heated · Try it
• Chlorine + ManganeseManganese(II) chloride Mn + Cl₂ → MnCl₂ · When heated · Try it
• Chlorine + IronIron(III) chloride 2Fe + 3Cl₂ → 2FeCl₃ · When heated · Try it
• Chlorine + CobaltCobalt(II) chloride Co + Cl₂ → CoCl₂ · When heated · Try it
• Chlorine + NickelNickel(II) chloride Ni + Cl₂ → NiCl₂ · When heated · Try it
• Chlorine + CopperCopper(II) chloride Cu + Cl₂ → CuCl₂ · When heated · Try it
• Chlorine + ZincZinc chloride Zn + Cl₂ → ZnCl₂ · When heated · Try it
• Chlorine + GalliumGallium chloride 2Ga + 3Cl₂ → 2GaCl₃ · When heated · Try it
• Chlorine + GermaniumGermanium chloride Ge + 2Cl₂ → GeCl₄ · When heated · Try it
• Chlorine + ArsenicArsenic trichloride 2As + 3Cl₂ → 2AsCl₃ · At room temperature · Try it
• Chlorine + SeleniumSelenium tetrachloride Se + 2Cl₂ → SeCl₄ · When heated · Try it
• Chlorine + BromineBromine monochloride Br₂ + Cl₂ → 2BrCl · At room temperature · Try it
• Chlorine + RubidiumRubidium chloride 2Rb + Cl₂ → 2RbCl · At room temperature · Try it
• Chlorine + StrontiumStrontium chloride Sr + Cl₂ → SrCl₂ · At room temperature · Try it
• Chlorine + YttriumYttrium chloride 2Y + 3Cl₂ → 2YCl₃ · When heated · Try it
• Chlorine + ZirconiumZirconium chloride Zr + 2Cl₂ → ZrCl₄ · When heated · Try it
• Chlorine + NiobiumNiobium chloride 2Nb + 5Cl₂ → 2NbCl₅ · When heated · Try it
• Chlorine + MolybdenumMolybdenum(V) chloride 2Mo + 5Cl₂ → 2MoCl₅ · When heated · Try it
• Chlorine + TechnetiumTechnetium(IV) chloride Tc + 2Cl₂ → TcCl₄ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + RutheniumRuthenium(III) chloride 2Ru + 3Cl₂ → 2RuCl₃ · When heated · Try it
• Chlorine + RhodiumRhodium chloride 2Rh + 3Cl₂ → 2RhCl₃ · When heated · Try it
• Chlorine + PalladiumPalladium(II) chloride Pd + Cl₂ → PdCl₂ · When heated · Try it
• Chlorine + SilverSilver chloride 2Ag + Cl₂ → 2AgCl · When heated · Try it
• Chlorine + CadmiumCadmium chloride Cd + Cl₂ → CdCl₂ · When heated · Try it
• Chlorine + IndiumIndium chloride 2In + 3Cl₂ → 2InCl₃ · When heated · Try it
• Chlorine + TinTin(IV) chloride Sn + 2Cl₂ → SnCl₄ · When heated · Try it
• Chlorine + TelluriumTellurium tetrachloride Te + 2Cl₂ → TeCl₄ · When heated · Try it
• Chlorine + IodineIodine monochloride I₂ + Cl₂ → 2ICl · At room temperature · Try it
• Chlorine + CaesiumCaesium chloride 2Cs + Cl₂ → 2CsCl · At room temperature · Try it
• Chlorine + BariumBarium chloride Ba + Cl₂ → BaCl₂ · At room temperature · Try it
• Chlorine + LanthanumLanthanum chloride 2La + 3Cl₂ → 2LaCl₃ · When heated · Try it
• Chlorine + CeriumCerium(III) chloride 2Ce + 3Cl₂ → 2CeCl₃ · When heated · Try it
• Chlorine + PraseodymiumPraseodymium chloride 2Pr + 3Cl₂ → 2PrCl₃ · When heated · Try it
• Chlorine + NeodymiumNeodymium chloride 2Nd + 3Cl₂ → 2NdCl₃ · When heated · Try it
• Chlorine + PromethiumPromethium chloride 2Pm + 3Cl₂ → 2PmCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + SamariumSamarium(III) chloride 2Sm + 3Cl₂ → 2SmCl₃ · When heated · Try it
• Chlorine + EuropiumEuropium(III) chloride 2Eu + 3Cl₂ → 2EuCl₃ · At room temperature · Try it
• Chlorine + GadoliniumGadolinium chloride 2Gd + 3Cl₂ → 2GdCl₃ · When heated · Try it
• Chlorine + TerbiumTerbium chloride 2Tb + 3Cl₂ → 2TbCl₃ · When heated · Try it
• Chlorine + DysprosiumDysprosium chloride 2Dy + 3Cl₂ → 2DyCl₃ · When heated · Try it
• Chlorine + HolmiumHolmium chloride 2Ho + 3Cl₂ → 2HoCl₃ · When heated · Try it
• Chlorine + ErbiumErbium chloride 2Er + 3Cl₂ → 2ErCl₃ · When heated · Try it
• Chlorine + ThuliumThulium chloride 2Tm + 3Cl₂ → 2TmCl₃ · When heated · Try it
• Chlorine + YtterbiumYtterbium(III) chloride 2Yb + 3Cl₂ → 2YbCl₃ · When heated · Try it
• Chlorine + LutetiumLutetium chloride 2Lu + 3Cl₂ → 2LuCl₃ · When heated · Try it
• Chlorine + HafniumHafnium chloride Hf + 2Cl₂ → HfCl₄ · When heated · Try it
• Chlorine + TantalumTantalum chloride 2Ta + 5Cl₂ → 2TaCl₅ · When heated · Try it
• Chlorine + TungstenTungsten(VI) chloride W + 3Cl₂ → WCl₆ · When heated · Try it
• Chlorine + RheniumRhenium(V) chloride 2Re + 5Cl₂ → 2ReCl₅ · When heated · Try it
• Chlorine + OsmiumOsmium(IV) chloride Os + 2Cl₂ → OsCl₄ · When heated · Try it
• Chlorine + IridiumIridium(III) chloride 2Ir + 3Cl₂ → 2IrCl₃ · When heated · Try it
• Chlorine + PlatinumPlatinum(II) chloride Pt + Cl₂ → PtCl₂ · When heated · Try it
• Chlorine + GoldGold(III) chloride 2Au + 3Cl₂ → 2AuCl₃ · When heated · Try it
• Chlorine + MercuryMercury(II) chloride Hg + Cl₂ → HgCl₂ · When heated · Try it
• Chlorine + ThalliumThallium(I) chloride 2Tl + Cl₂ → 2TlCl · When heated · Try it
• Chlorine + LeadLead(II) chloride Pb + Cl₂ → PbCl₂ · When heated · Try it
• Chlorine + BismuthBismuth(III) chloride 2Bi + 3Cl₂ → 2BiCl₃ · When heated · Try it
• Chlorine + PoloniumPolonium(IV) chloride Po + 2Cl₂ → PoCl₄ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + RadiumRadium chloride Ra + Cl₂ → RaCl₂ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + ActiniumActinium chloride 2Ac + 3Cl₂ → 2AcCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + ThoriumThorium chloride Th + 2Cl₂ → ThCl₄ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + ProtactiniumProtactinium chloride 2Pa + 5Cl₂ → 2PaCl₅ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + UraniumUranium(IV) chloride U + 2Cl₂ → UCl₄ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + NeptuniumNeptunium(IV) chloride Np + 2Cl₂ → NpCl₄ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + PlutoniumPlutonium(III) chloride 2Pu + 3Cl₂ → 2PuCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + AmericiumAmericium chloride 2Am + 3Cl₂ → 2AmCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + CuriumCurium chloride 2Cm + 3Cl₂ → 2CmCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + BerkeliumBerkelium chloride 2Bk + 3Cl₂ → 2BkCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + CaliforniumCalifornium chloride 2Cf + 3Cl₂ → 2CfCl₃ · Only in a special nuclear lab (it is radioactive) · Try it
• Chlorine + EinsteiniumEinsteinium chloride 2Es + 3Cl₂ → 2EsCl₃ · Only in a special nuclear lab (it is radioactive) · Try it

Nothing happens when it's simply mixed with 10 of the others. 21 pairings have never been tried, because not enough atoms have ever existed.