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Table of isotope composition for all elements
Table shows isotopic composition of chemical elements occuring permanently in nature. Isotopes obtained artificially are not presented here.

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Stable isotopics

Atomic numberElement nameElement symbolIsotopic composition
1HydrogenH1H (99.985%)
2H (0.015%)
3H (trace amount)
2HeliumHe3He (0.000137%)
4He (99.999863%)
3LithiumLi6Li (7.5%)
7Li (92.5%)
4BerylliumBe9Be (~100%)
10Be (trace amount)
5BoronB10B (19.9%)
11B (80.1%)
6CarbonC12C (98.9%)
13C (1.1%)
14C (trace amount)
7NitrogenN14N (99.634%)
15N (0.366%)
8OxygenO16O (99.762%)
17O (0.038%)
18O (0.2%)
9FluorineF19F (100%)
10NeonNe20Ne (90.48%)
21Ne (0.27%)
22Ne (9.25%)
11SodiumNa23Na (100%)
12MagnesiumMg24Mg (78.9%)
25Mg (10%)
26Mg (11.01%)
13AluminiumAl27Al (100%)
14SiliconSi28Si (92.23%)
29Si (4.67%)
30Si (3.1%)
15PhosphorousP31P (100%)
16SulfurS32S (95%)
33S (0.75%)
34S (4.2%)
36S (0.017%)
17ChlorineCl35Cl (75.77%)
37Cl (24.23%)
18ArgonAr36Ar (0.337%)
38Ar (0.063%)
40Ar (99.6%)
19PotassiumK39K (93.2581%)
40K (0.0117%)
41K (6.7302%)
20CalciumCa40Ca (96.941%)
42Ca (0.647%)
43Ca (0.135%)
44Ca (2.086%)
46Ca (0.004%)
48Ca (0.187%)
21ScandiumSc45Sc (100%)
22TitaniumTi46Ti (8%)
47Ti (7.4%)
48Ti (73.8%)
49Ti (5.5%)
50Ti (5.3%)
23VanadiumV50V (0.25%)
51V (99.75%)
24ChromiumCr50Cr (4.345%)
52Cr (83.789%)
53Cr (9.501%)
54Cr (2.365%)
25ManganeseMn55Mn (100%)
26IronFe54Fe (5.8%)
56Fe (91.72%)
57Fe (2.1%)
58Fe (0.28%)
27CobaltCo59Co (100%)
28NickelNi58Ni (68.077%)
60Ni (26.233%)
61Ni (1.14%)
62Ni (3.634%)
64Ni (0.926%)
29CopperCu63Cu (69.17%)
65Cu (30.83%)
30ZincZn64Zn (48.6%)
66Zn (27.9%)
67Zn (4.1%)
68Zn (18.8%)
70Zn (0.6%)
31GalliumGa69Ga (60.108%)
71Ga (39.892%)
32GermaniumGe70Ge (21.23%)
72Ge (27.66%)
73Ge (7.73%)
74Ge (35.94%)
76Ge (7.44%)
33ArsenicAs75As (100%)
34SeleniumSe74Se (0.89%)
76Se (9.36%)
77Se (7.63%)
78Se (23.78%)
80Se (49.61%)
82Se (8.73%)
35BromineBr79Br (50.69%)
81Br (49.31%)
36KryptonKr78Kr (0.35%)
80Kr (2.25%)
82Kr (11.6%)
83Kr (11.5%)
84Kr (57%)
86Kr (17.3%)
37RubidiumRb85Rb (72.165%)
87Rb (27.835%)
38StrontiumSr84Sr (0.56%)
86Sr (9.86%)
87Sr (7%)
88Sr (82.58%)
39YttriumY89Y (100%)
40ZirconiumZr90Zr (51.45%)
91Zr (11.22%)
92Zr (17.15%)
94Zr (17.38%)
96Zr (2.8%)
41NiobiumNb93Nb (100%)
42MolybdeniumMo92Mo (14.84%)
94Mo (9.25%)
95Mo (15.92%)
96Mo (16.68%)
97Mo (9.55%)
98Mo (24.13%)
100Mo (9.63%)
43TechnetiumTcNo stable isotopes
44RutheniumRu96Ru (5.52%)
98Ru (1.88%)
99Ru (12.7%)
100Ru (12.6%)
101Ru (17%)
102Ru (13.6%)
104Ru (18.7%)
45RhodiumRh103Rh (100%)
46PalladiumPd102Pd (1.02%)
104Pd (11.4%)
105Pd (22.33%)
106Pd (27.33%)
107Pd (trace amount)
108Pd (26.46%)
110Pd (11.72%)
47SilverAg107Ag (51.839%)
109Ag (48.161%)
48CadmiumCd106Cd (1.22%)
108Cd (0.88%)
110Cd (12.4%)
111Cd (12.8%)
112Cd (14%)
113Cd (12.3%)
114Cd (28.8%)
116Cd (7.6%)
49IndiumIn113In (4.3%)
115In (95.7%)
50TinSn112Sn (0.97%)
114Sn (0.65%)
115Sn (0.34%)
116Sn (14.53%)
117Sn (7.68%)
118Sn (24.23%)
119Sn (8.59%)
120Sn (32.59%)
122Sn (4.63%)
124Sn (5.79%)
51AntimonySb121Sb (57.36%)
123Sb (42.64%)
52TelluriumTe120Te (0.096%)
122Te (2.603%)
123Te (0.908%)
124Te (4.816%)
125Te (7.139%)
126Te (18.95%)
128Te (31.69%)
130Te (33.8%)
53IodineI127I (~100%)
129I (trace amount)
54XenonXe124Xe (0.1%)
126Xe (0.09%)
128Xe (1.91%)
129Xe (26.4%)
130Xe (4.1%)
131Xe (21.2%)
132Xe (26.9%)
134Xe (10.4%)
136Xe (8.9%)
55CesiumCs133Cs (100%)
56BariumBa130Ba (0.106%)
132Ba (0.101%)
134Ba (2.417%)
135Ba (6.592%)
136Ba (7.854%)
137Ba (11.23%)
138Ba (71.7%)
57LanthanumLa138La (0.0902%)
139La (99.9098%)
58CeriumCe136Ce (0.19%)
138Ce (0.25%)
140Ce (88.45%)
142Ce (11.11%)
59PraseodymiumPr141Pr (100%)
60NeodymiumNd142Nd (27.13%)
143Nd (12.18%)
144Nd (23.8%)
145Nd (8.3%)
146Nd (17.19%)
148Nd (5.76%)
150Nd (5.64%)
61PromethiumPm147Pm (trace amount)
62SamariumSm144Sm (3.07%)
147Sm (14.99%)
148Sm (11.24%)
149Sm (13.82%)
150Sm (7.38%)
152Sm (26.75%)
154Sm (22.75%)
63EuropiumEu151Eu (47.8%)
153Eu (52.2%)
64GadoliniumGd152Gd (0.2%)
154Gd (2.18%)
155Gd (14.8%)
156Gd (20.47%)
157Gd (15.65%)
158Gd (24.84%)
160Gd (21.28%)
65TerbiumTb159Tb (100%)
66DysprosiumDy156Dy (0.06%)
158Dy (0.1%)
160Dy (2.34%)
161Dy (18.91%)
162Dy (25.51%)
163Dy (24.9%)
164Dy (28.18%)
67HolmiumHo165Ho (100%)
68ErbiumEr162Er (0.14%)
164Er (1.61%)
166Er (33.6%)
167Er (22.95%)
168Er (26.8%)
170Er (14.9%)
69ThuliumTm169Tm (100%)
70YtterbiumYb168Yb (0.13%)
170Yb (3.05%)
171Yb (14.3%)
172Yb (21.9%)
173Yb (16.12%)
174Yb (31.8%)
176Yb (12.7%)
71LutetiumLu175Lu (97.41%)
176Lu (2.59%)
72HafniumHf174Hf (0.162%)
176Hf (5.206%)
177Hf (18.606%)
178Hf (27.297%)
179Hf (13.629%)
180Hf (35.1%)
73TantalumTa180Ta (0.012%)
181Ta (99.998%)
74TungstenW180W (0.13%)
182W (26.3%)
183W (14.3%)
184W (30.67%)
186W (28.6%)
75RheniumRe185Re (37.4%)
187Re (62.6%)
76OsmiumOs184Os (0.02%)
186Os (1.59%)
187Os (1.96%)
188Os (13.24%)
189Os (16.15%)
190Os (26.26%)
192Os (40.78%)
77IridiumIr191Ir (37.3%)
193Ir (62.7%)
78PlatinumPt192Pt (0.79%)
194Pt (32.9%)
195Pt (33.81%)
196Pt (25.3%)
198Pt (7.2%)
79GoldAu197Au (100%)
80MercuryHg196Hg (0.15%)
198Hg (9.97%)
199Hg (16.87%)
200Hg (23.1%)
201Hg (13.18%)
202Hg (29.86%)
204Hg (6.87%)
81ThaliumTl203Tl (29.524%)
205Tl (70.476%)
82LeadPb204Pb (1.4%)
206Pb (24.1%)
207Pb (22.1%)
208Pb (52.4%)
83BismuthBi209Bi (100%)
84PoloniumPo210Po (trace amount)
85AstatineAtNo stable isotopes
86RadonRn222Rn (100%)
87FranciumFr223Fr (trace amount)
88RadiumRa226Ra (trace amount)
89ActiniumAc227Ac (100%)
90ThoriumTh227Th (trace amount)
228Th (trace amount)
230Th (trace amount)
231Th (trace amount)
232Th (~100%)
234Th (trace amount)
91ProtactiniumPa231Pa (100%)
92UraniumU234U (0.006%)
235U (0.72%)
238U (99.275%)
93NeptuniumNpNo stable isotopes
94PlutoniumPu239Pu (trace amount)
244Pu (trace amount)
95AmericiumAmNo stable isotopes
96CuriumCmNo stable isotopes
97BerkeliumBkNo stable isotopes
98CaliforniumCfNo stable isotopes
99EinsteiniumEsNo stable isotopes
100FermiumFmNo stable isotopes
101MendeleviumMdNo stable isotopes
102NobeliumNoNo stable isotopes
103LawrenciumLrNo data
104RutherfordiumRfNo data

Some facts

  • Isotopes are varieties of the same chemical element differing by mass number.
  • The atoms of two different isotopes have different numbers of neutrons in the atomic nucleus.
  • The number of protons (atomic number) for two different isotopes is identical. For this reason, it is still the same chemical element.
  • Isotopes can be divided into two groups due to their stability: stable and unstable (otherwise known as radioactive).
  • The percentage composition of stable isotopes is constant and specific for a given element.
  • ⓘ Example: There are three isotopes of oxygen in nature in the following percentages:
    • 16O - 99.762%,
    • 17O - 0.038%,
    • 18O - 0.2%
  • The existence of isotopes is the main reason why the average atomic mass of elements is not an integer number.

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