Cl Atomic Mass

01-05-2021 by



Name: Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: 35.4527 amu Melting Point:-100.98 °C (172.17 K, -149.764 °F) Boiling Point:-34.6 °C (238.55 K, -30.279997 °F) Number of Protons/Electrons: 17 Number of Neutrons: 18 Classification: Halogen Crystal Structure: Orthorhombic Density @ 293 K: 3.214 g/cm 3 Color: green Atomic Structure. Chlorine (Cl) Atomic Data for Chlorine (Cl) Atomic Number = 17 Atomic Weight = 35.4527 Reference E95: Isotope: Mass: Abundance: Spin: Mag Moment: 35 Cl: 34.968852: 75.77%: 3/2 +0.82187: 37 Cl: 36.965903: 24.23%: 3/2 +0.68412: Cl I Ground State 1s 2 2s 2 2p 6 3s 2 3p 5 2 P. Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature. Isotopes: atoms with identical atomic numbers but different mass numbers (that is, same number of protons but different numbers of neutrons) Average atomic mass of carbon = (0.09890)(12.00000 amu) + (0.0110)(13.00335 amu) = 12.0107 amu Example If chlorine is 75.78% Cl-35 with a mass of 34.9689 amu and the rest Cl-37 with a mass of 36.9659 amu.

The elements of the periodic table sorted by atomic mass

click on any element's name for further information on chemical properties, environmental data or health effects.

This list contains the 118 elements of chemistry.

The chemical elements of
the periodic chart sorted by:

Atomic Mass

Name chemical elementSymbolAtomic number
- Name alphabetically1.0079HydrogenH1
- Atomic number4.0026HeliumHe2
- Symbol6.941LithiumLi3
- Atomic Mass9.0122BerylliumBe4
- Electronegativity10.811BoronB5
- Density12.0107CarbonC6
- Melting point14.0067NitrogenN7
- Boiling point15.9994OxygenO8
- Vanderwaals radius18.9984FluorineF9
- Year of discovery20.1797NeonNe10
- Inventor surname22.9897SodiumNa11
- Elements in earthcrust24.305MagnesiumMg12
- Elements in human body26.9815AluminumAl13
- Covalenz radius28.0855SiliconSi14
- Ionization energy30.9738PhosphorusP15

For chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight).

The lightest chemical element is Hydrogen and the heaviest is Hassium.

The unity for atomic mass is gram per mol.

Please note that the elements do not show their natural relation towards each other as in the Periodic system. There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals.

32.065SulfurS16
35.453ChlorineCl17
39.0983PotassiumK19
39.948ArgonAr18
40.078CalciumCa20
44.9559ScandiumSc21
47.867TitaniumTi22
50.9415VanadiumV23
51.9961ChromiumCr24
54.938ManganeseMn25
55.845IronFe26
58.6934NickelNi28
58.9332CobaltCo27
63.546CopperCu29
65.39ZincZn30
69.723GalliumGa31
72.64GermaniumGe32
74.9216ArsenicAs33
78.96SeleniumSe34
79.904BromineBr35
83.8KryptonKr36
85.4678RubidiumRb37
87.62StrontiumSr38
88.9059YttriumY39
91.224ZirconiumZr40
92.9064NiobiumNb41
95.94MolybdenumMo42
98TechnetiumTc43
101.07RutheniumRu44
102.9055RhodiumRh45
106.42PalladiumPd46
107.8682SilverAg47
112.411CadmiumCd48
114.818IndiumIn49
118.71TinSn50
121.76AntimonySb51
126.9045IodineI53
127.6TelluriumTe52
131.293XenonXe54
132.9055CesiumCs55
137.327BariumBa56
138.9055LanthanumLa57
140.116CeriumCe58
140.9077PraseodymiumPr59
144.24NeodymiumNd60
145PromethiumPm61
150.36SamariumSm62
151.964EuropiumEu63
157.25GadoliniumGd64
158.9253TerbiumTb65
162.5DysprosiumDy66
164.9303HolmiumHo67
167.259ErbiumEr68
168.9342ThuliumTm69
173.04YtterbiumYb70
174.967LutetiumLu71
178.49HafniumHf72
180.9479TantalumTa73
183.84TungstenW74
186.207RheniumRe75
190.23OsmiumOs76
192.217IridiumIr77
195.078PlatinumPt78
196.9665GoldAu79
200.59MercuryHg80
204.3833ThalliumTl81
207.2LeadPb82
208.9804BismuthBi83
209PoloniumPo84
210AstatineAt85
222RadonRn86
223FranciumFr87
226RadiumRa88
227ActiniumAc89
231.0359ProtactiniumPa91
232.0381ThoriumTh90
237NeptuniumNp93
238.0289UraniumU92
243AmericiumAm95
244PlutoniumPu94
247CuriumCm96
247BerkeliumBk97
251CaliforniumCf98
252EinsteiniumEs99
257FermiumFm100
258MendeleviumMd101
259NobeliumNo102
261RutherfordiumRf104
262LawrenciumLr103
262DubniumDb105
264BohriumBh107
266SeaborgiumSg106
268MeitneriumMt109
272RoentgeniumRg111
277HassiumHs108
DarmstadtiumDs110
CoperniciumCn112
NihoniumNh113
FleroviumFl114
MoscoviumMc115
LivermoriumLv116
TennessineTs117
OganessonOg118

Click here: for a schematic overview of the periodic table of elements in chart form

Do you need to know the weight of some molecules? Try our Molecular Weight Calculator!

Cl Atomic Mass Rounded

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Cl Atomic Weight

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Cl 35 Atomic Mass

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Molar Mass, Molecular Weight and Elemental Composition Calculator

Cl Atomic Mass


Molar mass of Cl2 is 70.9060 g/mol
Compound name is chlorine
Convert between Cl2 weight and moles
CompoundMolesWeight, g
Cl2

Elemental composition of Cl2
ElementSymbolAtomic weightAtomsMass percent
ChlorineCl35.4532100.0000

Mass percent compositionAtomic percent composition

Sample reactions for Cl2
EquationReaction type
Fe + Cl2 = FeCl3synthesis
Na + Cl2 = NaClsynthesis
KI + Cl2 = KCl + I2single replacement
H2 + Cl2 = HClsynthesis
Cl2 + NaBr = NaCl + Br2single replacement

Formula in Hill system is Cl2

Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:
  • Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
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  • parantesis () or brackets [].
  • Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.
Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

Computing molecular weight (molecular mass)

To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.
Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2.

Definitions of molecular mass, molecular weight, molar mass and molar weight

  • Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
  • Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Weights of atoms and isotopes are from NIST article.
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