Isotopes

Isotopes table*

ElementAverage massIsotope 0Abundance 0Isotope +1Abundance +1Isotope +2Abundance +2Isotope +3Abundance +3Isotope +4Abundance +4Isotope +5Abundance +5Isotope +6Abundance +6Isotope +7Abundance +7Isotope +8Abundance +8Isotope +9Abundance +9
H
1.007941.007825032199.9844262.01410177800.015574----------------
He
4.0026023.01602930970.00013434.002603249799.9998657----------------
Li
6.9416.01512237.5897.016004092.411----------------
Be
9.0121829.0121821100------------------
B
10.81110.012937019.8211.009305580.18----------------
C
12.010712.000000098.892213.00335483781.1078----------------
N
14.006714.003074005299.633715.00010889840.3663----------------
O
15.999415.994914622199.762816.999131500.037217.99916040.20004--------------
F
18.998403218.99840320100------------------
Ne
20.179719.992440175990.483820.993846740.269621.991385519.2465--------------
Na
22.98977022.98976967100------------------
Mg
24.305023.9850419078.99224.9858370210.00325.9825930411.005--------------
Al
26.98153826.98153844100------------------
Si
28.085527.976926532792.2296828.976494724.6831629.973770223.08716--------------
P
30.97376130.97376151100------------------
S
32.06531.9720706995.01832.971458500.75033.967866834.21535.967080880.017------------
Cl
35.45334.9688527175.77136.9659026024.229----------------
Ar
39.94835.967546280.336537.96273220.063239.96238312399.6003--------------
K
39.098338.963706993.2581139.963998670.01167240.961825976.73022--------------
Ca
40.07839.962591296.94141.95861830.64742.95876680.13543.95548112.08645.95369280.00447.9525340.187--------
Sc
44.95591044.9559102100------------------
Ti
47.86745.95262958.24946.95176387.43747.947947173.72048.94787085.40949.94479215.185----------
V
50.941549.94716280.249750.943963799.7503----------------
Cr
51.996149.94604964.345251.940511983.789552.94065389.500653.93888492.3647------------
Mn
54.93804954.9380496100------------------
Fe
55.84553.93961485.84555.934942191.75456.93539872.119157.93328050.2819------------
Co
58.93320058.9332002100------------------
Ni
58.693457.935347968.076959.930790626.223160.93106041.139961.92834883.634563.92796960.9256----------
Cu
63.54662.929601169.17464.927793730.826----------------
Zn
65.3963.929146648.6365.926036827.9066.92713094.1067.924847618.7569.9253250.62----------
Ga
69.72368.92558160.107970.924705039.8921----------------
Ge
72.6469.924250421.23471.922076227.66272.92345947.71773.921178235.94375.92140277.444----------
As
74.9216074.9215964100------------------
Se
78.9673.92247660.88975.91921419.36676.91991467.63577.917309523.77279.916521849.60781.91670008.731--------
Br
79.90478.918337650.68680.91629149.314----------------
Kr
83.8077.9203860.3535179.9163782.2808681.913484611.5830482.91413611.4953383.91150756.9889085.910610317.29835--------
Rb
85.467884.911789372.165486.909183527.8346----------------
Sr
87.6283.9134250.557485.90926249.856686.90887937.001587.905614382.5845------------
Y
88.9058588.9058479100------------------
Zr
91.22489.904703751.45290.905645011.22391.905040117.14693.906315817.38095.9082762.799----------
Nb
92.9063892.9063775100------------------
Mo
95.9491.90681014.836293.90508769.246694.905841515.920195.904678916.675696.90602109.555197.905407824.132999.9074779.6335------
Ru
101.0795.9075985.542097.9052871.868898.905939312.757999.904219712.5985100.905582217.0600101.904349531.5519103.90543018.6210------
Rh
102.90550102.905504100------------------
Pd
106.42101.9056081.020103.90403511.14104.90508422.33105.90348327.33107.90389426.46109.90515211.72--------
Ag
107.8682106.90509351.8392108.90475648.1608----------------
Cd
112.411105.9064581.25107.9041830.89109.90300612.49110.90418212.80111.902757224.13112.904400912.22113.903358128.73115.9047557.49----
In
114.818112.9040614.288114.90387895.712----------------
Sn
118.710111.9048210.973113.9027820.659114.9033460.339115.90174414.536116.9029547.676117.90160624.223118.9033098.585119.902196632.593121.90344014.629123.90527465.789
Sb
121.760120.903818057.213122.904215742.787----------------
Te
127.60119.9040200.096121.90304712.603122.90427300.908123.90281954.816124.90442477.139125.903305518.952127.904461431.687129.906222833.799----
I
126.90447126.904468100------------------
Xe
131.293123.90589580.08913125.9042690.08880127.90353041.91732128.904779526.43964129.90350794.08271130.905081921.17961131.904154526.89157133.905394510.44232135.9072208.86890--
Cs
132.90545132.905447100------------------
Ba
137.327129.9063100.1058131.9050560.1012133.9045032.417134.9056836.592135.9045707.853136.90582111.232137.90524171.699------
La
138.9055137.9071070.09017138.90634899.90983----------------
Ce
140.116135.9071400.186137.9059860.251139.90543488.449141.90924011.114------------
Pr
140.90765140.907648100------------------
Nd
144.24141.90771927.16142.90981012.18143.91008323.83144.9125698.30145.91311217.17147.9168895.74149.9208875.62------
Sm
150.36143.9119953.0734146.91489314.9934147.91481811.2406148.91718013.8189149.9172717.3796151.91972826.7421153.92220522.7520------
Eu
151.964150.91984647.810152.92122652.190----------------
Gd
157.25151.9197880.2029153.9208622.1809154.92261914.7998155.92212020.4664156.92395715.6518157.92410124.8347159.92705121.8635------
Tb
158.92534158.925343100------------------
Dy
162.50155.9242780.056157.9244050.096159.9251942.34160.92693018.91161.92679525.51162.92872824.90163.92917128.19------
Ho
164.93032164.930319100------------------
Er
167.259161.9287750.137163.9291971.609165.93029033.61166.93204522.93167.93236826.79169.93546014.93--------
Tm
168.93421168.934211100------------------
Yb
173.04167.9338940.127169.9347593.04170.93632214.28171.936377721.83172.938206816.13173.938858131.83175.94256812.76------
Lu
174.967174.940767997.416175.94268242.584----------------
Hf
178.49173.9400400.1620175.94140185.2604176.943220018.5953177.943697727.2811178.945815113.6210179.946548835.0802--------
Ta
180.9479179.9474660.0123180.94799699.9877----------------
W
183.84179.9467060.1198181.94820626.4985182.950224514.3136183.950932630.6422185.95436228.4259----------
Re
186.207184.952955737.398186.955750862.602----------------
Os
190.23183.9524910.0197185.9538381.5859186.95574791.9644187.955836013.2434188.958144916.1466189.95844526.2584191.96147940.7815------
Ir
192.217190.96059137.272192.96292462.728----------------
Pt
195.078189.9599300.013634191.9610350.782659193.96266432.96700194.96477433.831557195.96493525.24166197.9678767.16349--------
Au
196.96655196.966552100------------------
Hg
200.59195.9658150.15344197.9667529.968198.96826216.873199.96830923.096200.97028513.181201.97062629.863203.9734766.865------
Tl
204.3833202.97232929.524204.97441270.476----------------
Pb
207.2203.9730291.4245205.97444924.1447206.97588122.0827207.97663652.3481------------
Bi
208.98038208.980383100------------------
Th
232.0381232.0380504100------------------
Pa
231.03588231.0358789100------------------
U
238.02891234.04094560.00548235.04392310.7200238.050782699.2745--------------

* This table shows the elements and their masses (average and isotopic) that are only considered by the program.

    References for Complete Listings
  1. "Isotopic Compositions of the Elements 1997", Pure Appl. Chem., 70(1), 217-235, 1998.

  2. "Atomic Weights of the Elements 1999", Pure Appl. Chem. 73(4), 667-683, 2001.