Element Chlorine

Chlorine ElementThe chloride ion is the anion (negatively charged ion) Cl−.
It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents.
Chloride salts such as sodium chloride are often very soluble in water.It is an essential electrolyte located in all body fluids responsible for maintaining acid/base balance, transmitting nerve impulses and regulating fluid in and out of cells. Less frequently, the word chloride may also form part of the “common” name of chemical compounds in which one or more chlorine atoms are covalently bonded.

Names and Identifiers

Chemical Formula:Cl
Molecular Weight:35.45300g/mol
EC Number :231-959-5
MDL Number:MFCD00010934
Color:greenish-yellow/  yellowish green
Other Names:Le chlore, Chlor, Cloro, Klor
PubChem CID:24526
IUPAC Name:Chloride
Canonical SMILES:[Cl]
ICSC Number:n/a

Physical & Chemical Properties

Density:0.996 g/mL at 25 °C(lit.)
Boiling Point:-34.04 °C, -29.272 °F, 239.11 K
Melting Point:-101.5 °C, -150.7 °F, 171.65 K
Molecular Formula:Cl
Flash Point:115 °F
Exact Mass:34.96890
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H270-H280-H315-H319-H331-H335-H400
Precautionary Statements:n/a
Hazard Codes:C: Corrosive;
Risk Phrases:10-20/21/22-34
Safety Phrases:16-24-26-36/37/39-45
RIDADR:UN 2924 3/PG 2
WGK Germany:3
Packaging Group:n/a
Hazard Class:n/a

Both Chlorine isotopes, Cl-35 and Cl-37, are used to study the toxicity of environmental pollutant and are usually supplied in the form of NaCl.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
35Cl34.968852721 (69)75.78 (4)3/20.8218736
37Cl36.96590262 (11)24.22 (4)3/20.6841230

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
36Cl35.9683069301000 yβ to 36Ar01.28547
38Cl37.968010637.2 mβ to 38Ar22.05
39Cl38.96800955.6 mβ to 39Ar3/2
40Cl39.970421.38 mβ to 40Ar2
41Cl40.970734 sβ to 41Ar
42Cl41.97326.8 sβ to 42Ar
43Cl42.97423.3 sβ to 43Ar

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