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Isotopic Abundances

The current values of the natural distribution of each isotope.

 

The isotopic abundance describes the relative number of atoms of a given isotope in a mixture of isotopes of a given chemical element, expressed as a fraction of all the atoms of that element [1].

 

Notes

Status: 2013; published in March 2016 [3].

The natural isotopic abundances given correspond to the current values from the CIAAW.

The table provides general information about each element, such as atomic number (Z), element symbol, and name.

 

Column 4 - A:

A is the mass number of the respective isotope, ie the sum of the protons and neutrons in the nucleus.

 

Column 5 to 7:

Columns five through seven list the actual isotopic abundances. For some elements, these are given in intervals (I1 to I2), since the terrestrial occurrences are subject to natural fluctuations. Elements with an isotope abundance = 1 (corresponding to 100 %) are mononuclide elements, ie the occurrences are composed of only one isotope. A dash means the element is not naturally occurring.

 

Column 8:

a - Geological materials are known in which the chemical element in question has an isotopic composition outside the limits for otherwise (normal) occurring materials. The difference between the atomic weight of the element of these materials and those given in the table may exceed the uncertainties stated.

b - Different isotopic compositions may occur in commercially available preparations due to unknown or accidental isotopic fractionation; the deviation from the value given here can be significant.

c - The range of isotopic composition on Earth varies and prevents accurate reporting. However, the reported value should be applicable to ordinary samples.

 

Table of natural isotopic abundances

ZSymbolElementACompositionI1I2Notes
12345678
1HHydrogen1()0.999720.99999b
2()0.000010.00028
2HeHelium30.000002(2)a, c
40.999998(2)
3LiLithium6()0.0190.078b
7()0.9220.981
4BeBeryllium91
5BBoron10()0.1890.204b
11()0.7960.811
6CCarbon12()0.98840.9904
13()0.00960.0116
7NNitrogen14()0.995780.99663
15()0.003370.00422
8OOxygen16()0.997380.99776
17()0.0003670.000400
18()0.001870.00222
9FFluorine191
10NeNeon200.9048(3)a, b
210.0027(1)
220.0925(3)
11NaSodium231
12MgMagnesium24()0.78880.7905
25()0.099880.10034
26()0.10960.1109
13AlAluminium271
14SiSilicon28()0.921910.92318
29()0.046450.04699
30()0.030370.03110
15PPhosphorus311
16SSulfur32()0.94410.9529
33()0.007290.00797
34()0.03960.0477
36()0.0001290.000187
17ClChlorine35()0.7550.761b
37()0.2390.245
18ArArgon360.003336(210)a, c
380.000629(70)
400.996035(250)
19KPotassium390.932581(44)
400.000117(1)
410.067302(44)
20CaCalcium400.96941(156)a
420.00647(23)
430.00135(10)
440.02086(110)
460.00004(3)
480.00187(21)
21ScScandium451
22TiTitan460.0825(3)
470.0744(2)
480.7372(3)
490.0541(2)
500.0518(2)
23VVanadium500.000250(10)
510.99750(10)
24CrChrome500.04345(13)
520.83789(18)
530.09501(17)
540.02365(7)
25MnManganese551
26FeIron540.05845(105)
560.91754(106)
570.02119(29)
580.00282(12)
27CoCobalt591
28NiNickel580.680769(190)c
600.262231(150)
610.011399(13)
620.036345(40)
640.009256(19)
29CuCopper630.6915(15)c
650.3085(15)
30ZnZinc640.4917(75)c
660.2773(98)
670.0404(16)
680.1845(63)
700.0061(10)
31GaGallium690.60108(50)
710.39892(50)
32GeGermanium700.2052(19)
720.2745(15)
730.0776(8)
740.3652(12)
760.0775(12)
33AsArsenic751
34SeSelenium740.0086(3)c
760.0923(7)
770.0760(7)
780.2369(22)
800.4980(36)
820.0882(15)
35BrBromine79()0.5050.508
81()0.4920.495
36KrKrypton780.00355(3)a, b
800.02286(10)
820.11593(31)
830.11500(19)
840.56987(15)
860.17279(41)
37RbRubidium850.7217(2)a
870.2783(2)
38SrStrontium840.0056(2)a, c
860.0986(20)
870.0700(20)
880.8258(35)
39YYttrium891
40ZrZirconium900.5145(4)a
910.1122(5)
920.1715(3)
940.1738(4)
960.0280(2)
41NbNiobium931
42MoMolybdenum920.14649(106)a
940.09187(33)
950.15873(30)
960.16673(8)
970.09582(15)
980.24292(80)
1000.09744(65)
43TcTechnetium[98]-
44RuRuthenium960.0554(14)a
980.0187(3)
990.1276(14)
1000.1260(7)
1010.1706(2)
1020.3155(14)
1040.1862(27)
45RhRhodium1031
46PdPalladium1020.0102(1)a
1040.1114(8)
1050.2233(8)
1060.2733(3)
1080.2646(9)
1100.1172(9)
47AgSilver1070.51839(8)a
1090.48161(8)
48CdCadmium1060.01245(22)a
1080.00888(11)
1100.12470(61)
1110.12795(12)
1120.24109(7)
1130.12227(7)
1140.28754(81)
1160.07512(54)
49InIndium1130.04281(52)
1150.95719(52)
50SnTin1120.0097(1)a
1140.0066(1)
1150.0034(1)
1160.1454(9)
1170.0768(7)
1180.2422(9)
1190.0859(4)
1200.3258(9)
1220.0463(3)
1240.0579(5)
51SbAntimony1210.5721(5)a
1230.4279(5)
52TeTellurium1200.0009(1)a
1220.0255(12)
1230.0089(3)
1240.0474(14)
1250.0707(15)
1260.1884(25)
1280.3174(8)
1300.3408(62)
53IIodine1271
54XeXenon1240.00095(5)a, b
1260.00089(3)
1280.01910(13)
1290.26401(138)
1300.04071(22)
1310.21232(51)
1320.26909(55)
1340.10436(35)
1360.08857(72)
55CsCaesium1331
56BaBarium1300.0011(1)
1320.0010(1)
1340.0242(15)
1350.0659(10)
1360.0785(24)
1370.1123(23)
1380.7170(29)
57LaLanthanum1380.0008881(71)a
1390.9991119(71)
58CeCerium1360.00186(2)a
1380.00251(2)
1400.88449(51)
1420.11114(51)
59PrPraseodymium1411
60NdNeodymium1420.27153(40)a
1430.12173(26)
1440.23798(19)
1450.08293(12)
1460.17189(32)
1480.05756(21)
1500.05638(28)
61PmPromethium[145]-
62SmSamarium1440.0308(4)a
1470.1500(14)
1480.1125(9)
1490.1382(10)
1500.0737(9)
1520.2674(9)
1540.2274(14)
63EuEuropium1510.4781(6)a
1530.5219(6)
64GdGadolinium1520.0020(3)a
1540.0218(2)
1550.1480(9)
1560.2047(3)
1570.1565(4)
1580.2484(8)
1600.2186(3)
65TbTerbium1591
66DyDysprosium1560.00056(3)a
1580.00095(3)
1600.02329(18)
1610.18889(42)
1620.25475(36)
1630.24896(42)
1640.28260(54)
67HoHolmium1651
68ErErbium1620.00139(5)a
1640.01601(3)
1660.33503(36)
1670.22869(9)
1680.26978(18)
1700.14910(36)
69TmThulium1691
70YbYtterbium1680.00126(1)a
1700.03023(2)
1710.14216(7)
1720.21754(10)
1730.16098(9)
1740.31896(26)
1760.12887(30)
71LuLutetium1750.97401(13)a
1760.02599(13)
72HfHafnium1740.0016(12)
1760.0526(70)
1770.1860(16)
1780.2728(28)
1790.1362(11)
1800.3508(33)
73TaTantalum1800.0001201(32)
1810.9998799(32)
74WTungsten1800.0012(1)
1820.2650(16)
1830.1431(4)
1840.3064(2)
1860.2843(19)
75ReRhenium1850.3740(5)
1870.6260(5)
76OsOsmium1840.0002(2)a
1860.0159(64)
1870.0196(17)
1880.1324(27)
1890.1615(23)
1900.2626(20)
1920.4078(32)
77IrIridium1910.373(2)
1930.627(2)
78PtPlatinum1900.00012(2)
1920.00782(24)
1940.32864(410)
1950.33775(240)
1960.25211(340)
1980.07356(130)
79AuGold1971
80HgMercury1960.0015(1)
1980.1004(3)
1990.1694(12)
2000.2314(9)
2010.1317(9)
2020.2974(13)
2040.0682(4)
81TlThallium203()0.29440.2959
205()0.70410.7056
82PbLead2040.014(6)a, c
2060.241(30)
2070.221(50)
2080.524(70)
83BiBismuth2091
84PoPolonium[209]-
85AtAstatine[210]-
86RnRadon[222]-
87FrFrancium[223]-
88RaRadium[226]-
89AcActinium[227]-
90ThThorium2300.0002(2)
2320.9998(2)
91PaProtactinium2311
92UUranium2340.000054(5)a, b
2350.007204(6)
2380.992742(10)

 

References:

[1] - Isotopic abundance.
IUPAC Gold Book, DOI 10.1351/goldbook.I03332.

[2] - IUPAC:
Standard Atomic Weight of Ytterbium Revised.
Chemistry International, (2015), DOI 10.1515/ci-2015-0512.

[3] - Juris Meija, Tyler B. Coplen, Michael Berglund, Willi A. Brand, Paul De Bičvre, Manfred Gröning, Norman E. Holden, Johanna Irrgeher, Robert D. Loss, Thomas Walczyk, Thomas Prohaska:
Isotopic Compositions of the Elements 2013 (IUPAC Technical Report).
Pure and Applied Chemistry, (2016), DOI 10.1515/pac-2015-0503.

 


Category: Isotopes

Last update: 11 October 2022



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