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17Cl

Chlorine

Halogen · 35.45 u · group 17, period 3

Chlorine · Cl

Identity

Atomic number17

SymbolCl

CategoryHalogen

Standard stateGas

Group · Period · Block17 · 3 · p

Electron configuration[Ne]3s2 3p5

Atomic

Atomic mass35.45 u

Atomic radius175 pm

Protons / Neutrons / Electrons17 / 18 / 17

Shells (e⁻ per shell)2, 8, 7

Chemical

Electronegativity (Pauling)3.16

Ionization energy12.968 eV

Electron affinity3.617 eV

Oxidation states+7, +5, +1, -1

Physical

Melting point171.7 K · -101.5 °C

Boiling point239.1 K · -34 °C

Density0.0032 g/cm³

History

Year discovered1774

CPK color

#1FF01F

State at room temp (25 °C)

gas

Position

Molecules with Cl

40 in library

Hydrochloric Acid

Iodine chloride

Chlorine monoxide

Chlorine Dioxide

Hypochlorous Acid

Boron Trichloride

Phosphorus trichloride

Aluminum Chloride

Thionyl Chloride

Sulfur monochloride

Chlorine trifluoride

Dichlorodifluoromethane

Trichlorofluoromethane

Chlorodifluoromethane

Dichloromethane

Carbon Tetrachloride

Silicon tetrachloride

Titanium Tetrachloride

Tin tetrachloride

Sulfuryl chloride

Phosphorus oxychloride

Trichloroethylene

Tetrachloroethylene

Perchloric Acid

Phosphorus pentachloride

Bromochloroacetic Acid

C₂H₂BrClO₂

Epichlorohydrin

H₆Cl₂N₂Pt

1,4-Dichlorobenzene

C₁₄H₁₁Cl₂NO₂

C₁₃H₁₆ClNO

C₁₂H₁₁ClN₂O₅S

C₁₆H₁₃ClN₂O

C₁₆H₁₈ClN₃S

C₁₈H₂₆ClN₃

C₂₂H₂₃ClN₂O₂

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