List of Chemical Isotopes

A table with the isotopes of all chemical elements. This list contains all naturally occurring isotopes and the most important of the artificially produced isotopes. There are also numerous other artificially generated, highly radioactive isotopes of each element, which have been omitted here. The list also contains the most important nuclear isomers. Isomers can be recognized by the superscript m next to the mass number.

P stands for the atomic number and thus the number of protons, N is the number of neutrons, u is the atomic mass unit. % indicates the natural frequency in percent, where * means that the isotope is only present in traces and - means no natural occurrence. The half-life can be specified in years (a), days (d), hours (h), minutes (min), seconds (s), milliseconds (ms, 10^-3s), microseconds (μs, 10^-6s) or nanoseconds (ns, 10^-9s).
The most common isotope of an element is shown in bold. Radioisotopes (radioactive isotopes) are italic and red, quasi-stable isotopes with extremely long half-lives and very weak radiation are italic and dark red.

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Isotope	Symbol	P	N	u	%	Half-life
Hydrogen 1 (Protium)	¹H	1	0	1.008	99.98	stable
Hydrogen 2 (Deuterium)	²H	1	1	2.014	0.02	stable
Hydrogen 3 (Tritium)	³H	1	2	3.016	* (10^-16)	12.32 a

Helium 2 (Diproton)	²He	2	0	2.016	-	<1 ns
Helium 3	³He	2	1	3.016	0.00014	stable
Helium 4	⁴He	2	2	4.003	99.99986	stable

Lithium 6	⁶Li	3	3	6.015	7.4	stable
Lithium 7	⁷Li	3	4	7.016	92.6	stable
Lithium 8	⁸Li	3	5	8.022	-	839 ms
Lithium 9	⁹Li	3	6	9.027	-	178 ms

Beryllium 7	⁷Be	4	3	7.017	*	53.12 d
Beryllium 8	⁸Be	4	4	8.005	-	6.722 * 10^-17 s
Beryllium 9	⁹Be	4	5	9.012	100	stable
Beryllium 10	¹⁰Be	4	6	10.014	*	1.51 * 10⁶ a
Beryllium 11	¹¹Be	4	7	11.022	-	13.81 s

Boron 8	⁸B	5	3	8.025	-	0.772 s
Boron 10	¹⁰B	5	5	10.013	19.9	stable
Boron 11	¹¹B	5	6	11.009	81.1	stable

Carbon 12	¹²C	6	6	12	98.9	stable
Carbon 13	¹³C	6	7	13.003	1.1	stable
Carbon 14	¹⁴C	6	8	14.003	1,25 * 10^-10	5730 a

Nitrogen 14	¹⁴N	7	7	14.003	99.634	stable
Nitrogen 15	¹⁵N	7	8	15.000	0.366	stable

Oxygen 16	¹⁶O	8	8	15.995	99.762	stable
Oxygen 17	¹⁷O	8	9	16.999	0.038	stable
Oxygen 18	¹⁸O	8	10	17.999	0.2	stable

Fluorine 17	¹⁷F	9	8	17.002	-	64.4 s
Fluorine 18	¹⁸F	9	9	18.001	-	109.7 min
Fluorine 19	¹⁹F	9	10	18.998	100	stable

Neon 20	²⁰Ne	10	10	19.992	90.48	stable
Neon 21	²¹Ne	10	11	20.994	0.27	stable
Neon 22	²²Ne	10	12	21.991	9.25	stable

Sodium 22	²²Na	11	11	21.994	*	2.602 a
Sodium 23	²³Na	11	12	22.990	100	stable

Magnesium 24	²⁴Mg	12	12	23.985	78.99	stable
Magnesium 25	²⁵Mg	12	13	24.986	10.00	stable
Magnesium 26	²⁶Mg	12	14	25.983	11.01	stable

Aluminium 26	²⁶Al	13	13	25.987	*	717240 a
Aluminium 27	²⁷Al	13	14	26.982	100	stable

Silicon 28	²⁸Si	14	14	27.977	92.23	stable
Silicon 29	²⁹Si	14	15	28.976	4.67	stable
Silicon 30	³⁰Si	14	16	29.974	3.1	stable
Silicon 32	³²Si	14	18	31.974	*	153 a

Phosphorus 31	³¹P	15	16	30.974	100	stable
Phosphorus 32	³²P	15	17	31.974	*	14.268 d
Phosphorus 33	³³P	15	18	32.972	-	25.35 d

Sulfur 32	³²S	16	16	31.972	95.02	stable
Sulfur 33	³³S	16	17	32.971	0.75	stable
Sulfur 34	³⁴S	16	18	33.968	4.20	stable
Sulfur 35	³⁵S	16	19	34.969	*	87.32 d
Sulfur 36	³⁶S	16	20	35.967	0.02	stable

Chlorine 35	³⁵Cl	17	18	34.969	75.77	stable
Chlorine 36	³⁶Cl	17	19	35.968	*	301315 a
Chlorine 37	³⁷Cl	17	20	36.966	24.23	stable

Argon 36	³⁶Ar	18	18	35.968	0.336	stable
Argon 37	³⁷Ar	18	19	36.967	-	35.011 d
Argon 38	³⁸Ar	18	20	37.963	0.063	stable
Argon 39	³⁹Ar	18	21	38.964	*	269 a
Argon 40	⁴⁰Ar	18	22	39.962	99.6	stable
Argon 42	⁴²Ar	18	24	41.963	*	32.9 a

Potassium 39	³⁹K	19	20	38.964	93.26	stable
Potassium 40	⁴⁰K	19	21	39.964	0.0117	1.248 * 10⁹ a
Potassium 41	⁴¹K	19	22	40.962	6.73	stable

Calcium 40	⁴⁰Ca	20	20	39.963	96.941	stable
Calcium 42	⁴²Ca	20	22	41.959	0.647	stable
Calcium 43	⁴³Ca	20	23	42.959	0.135	stable
Calcium 44	⁴⁴Ca	20	24	43.955	2.086	stable
Calcium 46	⁴⁶Ca	20	26	45.954	0.004	stable
Calcium 48	⁴⁸Ca	20	28	47.953	0.187	>6.4 * 10¹⁹ a

Scandium 45	⁴⁵Sc	21	24	44.956	100	stable

Titanium 46	⁴⁶Ti	22	24	45.953	8.0	stable
Titanium 47	⁴⁷Ti	22	25	46.952	7.3	stable
Titanium 48	⁴⁸Ti	22	26	47.948	73.8	stable
Titanium 49	⁴⁹Ti	22	27	48.948	5.5	stable
Titanium 50	⁵⁰Ti	22	28	49.945	5.4	stable

Vanadium 48	⁴⁸Mn	23	25	47.952	-	15.973 d
Vanadium 49	⁴⁹Mn	23	26	48.949	-	329 d
Vanadium 50	⁵⁰V	23	27	49.947	0.25	1.5 * 10¹⁷ a
Vanadium 51	⁵¹V	23	28	50.944	99.75	stable

Chromium 50	⁵⁰Cr	24	26	49.946	4.345	>1.8 * 10¹⁷ a
Chromium 52	⁵²Cr	24	28	51.941	83.789	stable
Chromium 53	⁵³Cr	24	29	52.941	9.501	stable
Chromium 54	⁵⁴Cr	24	30	53.939	2.364	stable

Manganese 53	⁵³Mn	25	28	52.941	*	3.74 * 10⁶ a
Manganese 55	⁵⁵Mn	25	30	54.938	100	stable

Iron 54	⁵⁴Fe	26	28	53.940	5.8	stable
Iron 56	⁵⁶Fe	26	30	55.935	91.72	stable
Iron 57	⁵⁷Fe	26	31	56.935	2.2	stable
Iron 58	⁵⁸Fe	26	32	57.933	0.28	stable
Iron 60	⁶⁰Fe	26	34	59.934	*	2.6 * 10⁶ a

Cobalt 56	⁵⁶Co	27	29	55,940	-	77,233 d
Cobalt 59	⁵⁹Co	27	32	58.933	100	stable
Cobalt 60	⁶⁰Co	27	33	59.934	-	5.2714 a

Nickel 48	⁴⁸Ni	28	20	48.020	-	10 ms
Nickel 56	⁵⁶Ni	28	28	55.942	-	6.075 d
Nickel 58	⁵⁸Ni	28	30	57.935	68.077	stable
Nickel 59	⁵⁹Ni	28	31	58.934	*	76500 a
Nickel 60	⁶⁰Ni	28	32	59.931	26.233	stable
Nickel 61	⁶¹Ni	28	33	60.931	1.14	stable
Nickel 62	⁶²Ni	28	34	61.928	3.634	stable
Nickel 63	⁶³Ni	28	35	62.930	-	100.1 a
Nickel 64	⁶⁴Ni	28	36	63.928	0.926	stable

Copper 63	⁶³Cu	29	34	62.930	69.17	stable
Copper 65	⁶⁵Cu	29	36	64.928	30.83	stable

Zinc 64	⁶⁴Zn	30	34	63.929	48.6	stable
Zinc 66	⁶⁶Zn	30	36	65.926	27.9	stable
Zinc 67	⁶⁷Zn	30	37	66.927	4.1	stable
Zinc 68	⁶⁸Zn	30	38	67.925	18.8	stable
Zinc 70	⁷⁰Zn	30	40	69.925	0.6	stable

Gallium 68	⁶⁸Ga	31	37	67.928	-	67.7 min
Gallium 69	⁶⁹Ga	31	38	68.926	60.1	stable
Gallium 71	⁷¹Ga	31	40	70.925	39.9	stable

Germanium 68	⁶⁸Ge	32	36	67.928	-	271 d
Germanium 70	⁷⁰Ge	32	38	69.924	20.5	stable
Germanium 72	⁷²Ge	32	40	71.922	27.4	stable
Germanium 73	⁷³Ge	32	41	72.923	7.8	stable
Germanium 74	⁷⁴Ge	32	42	73.921	36.5	stable
Germanium 76	⁷⁶Ge	32	44	75.921	7.44	1.9 * 10²¹ a

Arsenic 75	⁷⁵As	33	42	74.922	100	stable

Selenium 74	⁷⁴Se	34	40	73.922	0.87	stable
Selenium 76	⁷⁶Se	34	42	75.919	9.36	stable
Selenium 77	⁷⁷Se	34	43	76.920	7.63	stable
Selenium 78	⁷⁸Se	34	44	77.917	23.78	stable
Selenium 79	⁷⁹Se	34	45	78.918	*	327800 a
Selenium 80	⁸⁰Se	34	46	79.917	49.61	stable
Selenium 82	⁸²Se	34	48	81.917	8.73	10²⁰ a

Bromine 79	⁷⁹Br	35	44	78.918	50.69	stable
Bromine 81	⁸¹Br	35	46	80.916	49.31	stable

Krypton 78	⁷⁸Kr	36	42	77.920	0.35	2.0 * 10²¹ a
Krypton 80	⁸⁰Kr	36	44	79.916	2.25	stable
Krypton 81	⁸¹Kr	36	45	80.917	*	229110 a
Krypton 82	⁸²Kr	36	46	81.913	11.6	stable
Krypton 83	⁸³Kr	36	47	82.914	11.5	stable
Krypton 84	⁸⁴Kr	36	48	83.912	57.0	stable
Krypton 85	⁸⁵Kr	36	49	84.913	*	10.756 a
Krypton 86	⁸⁶Kr	36	50	85.911	17.3	stable

Rubidium 85	⁸⁵Rb	37	48	84.912	72.17	stable
Rubidium 87	⁸⁷Rb	37	50	86.909	27.83	4.9 * 10¹⁰ a

Strontium 84	⁸⁴Sr	38	46	83.913	0.56	stable
Strontium 86	⁸⁶Sr	38	48	85.909	9.86	stable
Strontium 87	⁸⁷Sr	38	49	86.909	7.00	stable
Strontium 88	⁸⁸Sr	38	50	87.906	82.58	stable
Strontium 89	⁸⁹Sr	38	51	88.907	-	50.57 d
Strontium 90	⁹⁰Sr	38	52	89.908	-	28.78 a

Yttrium 89	⁸⁹Y	39	50	88.906	100	stable

Zirconium 90	⁹⁰Zr	40	50	89.905	51.45	stable
Zirconium 91	⁹¹Zr	40	51	90.906	11.22	stable
Zirconium 92	⁹²Zr	40	52	91.905	17.15	stable
Zirconium 93	⁹³Zr	40	53	92.906	*	1.53 * 10⁶ a
Zirconium 94	⁹⁴Zr	40	54	93.906	17.38	stable
Zirconium 95	⁹⁵Zr	40	55	94.908	-	64.03 d
Zirconium 96	⁹⁶Zr	40	56	95.908	2.8	2.4 * 10¹⁹ a

Niobium 92	⁹²Nb	41	51	91.907	*	3.47 * 10⁷ a
Niobium 93	⁹³Nb	41	52	92.906	100	stable
Niobium 94	⁹⁴Nb	41	53	93.907	*	20300 a

Molybdenum 92	⁹²Mo	42	50	91.907	14.84	stable
Molybdenum 94	⁹⁴Mo	42	52	93.905	9.25	stable
Molybdenum 95	⁹⁵Mo	42	53	94.906	15.92	stable
Molybdenum 96	⁹⁶Mo	42	54	95.905	16.68	stable
Molybdenum 97	⁹⁷Mo	42	55	96.906	9.55	stable
Molybdenum 98	⁹⁸Mo	42	56	97.905	24.13	stable
Molybdenum 99	⁹⁹Mo	42	57	98.908	-	2.7489 d
Molybdenum 100	¹⁰⁰Mo	42	58	99.907	9.63	7.3 * 10¹⁸ a

Technetium 97	⁹⁷Tc	43	54	96.906	-	4.21 * 10⁶ a
Technetium 98	⁹⁸Tc	43	55	97.907	-	4.2 * 10⁶ a
Technetium 99	⁹⁹Tc	43	56	98.906	100	211112 a
Technetium 99^m	^99mTc	43	56		-	6.01 h

Ruthenium 96	⁹⁶Ru	44	52	95.908	5.52	stable
Ruthenium 98	⁹⁸Ru	44	54	97.905	1.88	stable
Ruthenium 99	⁹⁹Ru	44	55	98.906	12.7	stable
Ruthenium 100	¹⁰⁰Ru	44	56	99.904	12.6	stable
Ruthenium 101	¹⁰¹Ru	44	57	100.906	17.0	stable
Ruthenium 102	¹⁰²Ru	44	58	101.904	31.6	stable
Ruthenium 103	¹⁰³Ru	44	59	102.906	-	39.26 d
Ruthenium 104	¹⁰⁴Ru	44	60	103.905	18.7	stable
Ruthenium 106	¹⁰⁶Ru	44	62	105.907	-	373.6 d

Rhodium 103	¹⁰³Rh	45	58	102.906	100	stable

Palladium 102	¹⁰²Pd	46	56	101.906	1.02	stable
Palladium 104	¹⁰⁴Pd	46	58	103.904	11.14	stable
Palladium 105	¹⁰⁵Pd	46	59	104.905	22.33	stable
Palladium 106	¹⁰⁶Pd	46	60	105.903	27.33	stable
Palladium 107	¹⁰⁷Pd	46	61	106.905	*	6.5 * 10⁶ a
Palladium 108	¹⁰⁸Pd	46	62	107.904	26.46	stable
Palladium 110	¹¹⁰Pd	46	64	109.906	11.72	stable

Silver 107	¹⁰⁷Ag	47	60	106.905	51.839	stable
Silver 108	¹⁰⁸Ag	47	61	107.906	-	2.37 min
Silver 108^m	^108mAg	47	61		-	418 a
Silver 109	¹⁰⁹Ag	47	62	108.905	48.161	stable

Cadmium 106	¹⁰⁶Cd	48	58	105.906	1.25	stable
Cadmium 108	¹⁰⁸Cd	48	60	107.904	0.89	stable
Cadmium 110	¹¹⁰Cd	48	62	109.903	12.49	stable
Cadmium 111	¹¹¹Cd	48	63	110.904	12.8	stable
Cadmium 112	¹¹²Cd	48	64	111.903	24.13	stable
Cadmium 113	¹¹³Cd	48	65	112.904	12.22	7.7 * 10¹⁵ a
Cadmium 114	¹¹⁴Cd	48	66	113.903	28.73	stable
Cadmium 116	¹¹⁶Cd	48	68	115.905	7.49	3 * 10¹⁹ a

Indium 113	¹¹³In	49	64	112.904	4.3	stable
Indium 115	¹¹⁵In	49	66	114.904	95.7	4.41 * 10¹⁴ a

Tin 112	¹¹²Sn	50	62	111.905	0.97	stable
Tin 114	¹¹⁴Sn	50	64	113.903	0.65	stable
Tin 115	¹¹⁵Sn	50	65	114.903	0.34	stable
Tin 116	¹¹⁶Sn	50	66	115.902	14.53	stable
Tin 117	¹¹⁷Sn	50	67	116.903	7.68	stable
Tin 118	¹¹⁸Sn	50	68	117.902	24.23	stable
Tin 119	¹¹⁹Sn	50	69	118.903	8.59	stable
Tin 120	¹²⁰Sn	50	70	119.902	32.59	stable
Tin 122	¹²²Sn	50	72	121.903	4.63	stable
Tin 124	¹²⁴Sn	50	74	123.905	5.79	stable
Tin 126	¹²⁶Sn	50	76	125.908	*	230140 a

Antimony 121	¹²¹Sb	51	70	120.904	57.36	stable
Antimony 123	¹²³Sb	51	72	122.904	42.64	stable

Tellurium 120	¹²⁰Te	52	68	119.904	0.096	2.2 * 10¹⁶ a
Tellurium 122	¹²²Te	52	70	121.903	2.603	stable
Tellurium 123	¹²³Te	52	71	122.904	0.908	1 * 10¹³ a
Tellurium 124	¹²⁴Te	52	72	123.903	4.816	stable
Tellurium 125	¹²⁵Te	52	73	124.904	7.139	stable
Tellurium 126	¹²⁶Te	52	74	125.903	18.952	stable
Tellurium 128	¹²⁸Te	52	76	127.904	31.687	7.2 * 10²⁴ a
Tellurium 129	¹²⁹Te	52	77	128.907	-	69.6 min
Tellurium 129^m	^129mTe	52	77		-	33.6 d
Tellurium 130	¹³⁰Te	52	78	129.906	33.799	7.9 * 10²⁰ a

Iodine 123	¹²³I	53	70	122.906	-	13.22 h
Iodine 125	¹²⁵I	53	72	124.905	-	59.4 d
Iodine 127	¹²⁷I	53	74	126.904	100	stable
Iodine 129	¹²⁹I	53	76	128.905	*	1.57 * 10⁷ a
Iodine 131	¹³¹I	53	78	130.906	-	8.0207 d
Iodine 133	¹³³I	53	80	132.908	-	20.8 h

Xenon 124	¹²⁴Xe	54	70	123.906	0.1	1.8 * 10²² a
Xenon 126	¹²⁶Xe	54	72	125.904	0.09	stable
Xenon 128	¹²⁸Xe	54	74	127.904	1.91	stable
Xenon 129	¹²⁹Xe	54	75	128.905	26.4	stable
Xenon 130	¹³⁰Xe	54	76	129.904	4.1	stable
Xenon 131	¹³¹Xe	54	77	130.905	21.29	stable
Xenon 132	¹³²Xe	54	78	131.904	26.9	stable
Xenon 133	¹³⁵Xe	54	79	132.906	-	5.25 d
Xenon 134	¹³⁴Xe	54	80	133.905	10.4	stable
Xenon 135	¹³⁵Xe	54	81	134.907	-	9.14 h
Xenon 136	¹³⁶Xe	54	82	135.907	8.9	2.11 * 10²¹ a

Caesium 133	¹³³Cs	55	78	132.905	100	stable
Caesium 134	¹³⁴Cs	55	79	133.907	-	2.07 a
Caesium 135	¹³⁵Cs	55	80	134.906	*	2.3 * 10⁶ a
Caesium 136	¹³⁶Cs	55	81	135.907	-	13.16 d
Caesium 137	¹³⁷Cs	55	82	136.907	-	30.17 a

Barium 130	¹³⁰Ba	56	74	129.906	0.106	1.6 * 10²¹ a
Barium 132	¹³²Ba	56	76	131.905	0.101	stable
Barium 134	¹³⁴Ba	56	78	133.905	2.417	stable
Barium 135	¹³⁵Ba	56	79	134.906	6.592	stable
Barium 136	¹³⁶Ba	56	80	135.905	7.850	stable
Barium 137	¹³⁷Ba	56	81	136.906	11.23	stable
Barium 138	¹³⁸Ba	56	82	137.905	71.7	stable
Barium 140	¹⁴⁰Ba	56	84	139.911	-	12.75 d

Lanthanum 138	¹³⁸La	57	81	137.907	0.09	1.05 * 10¹¹ a
Lanthanum 139	¹³⁹La	57	82	138.906	99.91	stable

Cerium 136	¹³⁶Ce	58	78	135.907	0.19	stable
Cerium 138	¹³⁸Ce	58	80	137.906	0.25	stable
Cerium 140	¹⁴⁰Ce	58	82	139.905	88.48	stable
Cerium 141	¹⁴¹Ce	58	83	140.908	-	32.51 d
Cerium 142	¹⁴²Ce	58	84	141.909	11.08	5 * 10¹⁶ a
Cerium 144	¹⁴⁴Ce	58	86	143.914	-	284.9 d

Praseodymium 141	¹⁴¹Pr	59	82	140.908	100	stable

Neodymium 142	¹⁴²Nd	60	82	141.908	27.13	stable
Neodymium 143	¹⁴³Nd	60	83	142.910	12.18	stable
Neodymium 144	¹⁴⁴Nd	60	84	143.910	23.8	2.29 * 10¹⁵ a
Neodymium 145	¹⁴⁵Nd	60	85	144.913	8.3	stable
Neodymium 146	¹⁴⁶Nd	60	86	145.913	17.19	stable
Neodymium 148	¹⁴⁸Nd	60	88	147.917	5.76	stable
Neodymium 150	¹⁵⁰Nd	60	90	149.921	5.64	1.1* 10¹⁹ a

Promethium 145	¹⁴⁵Pm	61	84	144.913	*	17.7 a
Promethium 146	¹⁴⁶Pm	61	85	145.915	-	5.53 a
Promethium 147	¹⁴⁷Pm	61	86	146.915	100	2.6234 a

Samarium 144	¹⁴⁴Sm	62	82	143.912	3.07	stable
Samarium 146	¹⁴⁶Sm	62	84	145.913	-	9.2 * 10⁷ a
Samarium 147	¹⁴⁷Sm	62	85	146.915	14.99	1.06 * 10¹¹ a
Samarium 148	¹⁴⁸Sm	62	86	147.915	11.24	7 * 10¹⁵ a
Samarium 149	¹⁴⁹Sm	62	87	148.917	13.82	stable
Samarium 150	¹⁵⁰Sm	62	88	149.917	7.38	stable
Samarium 152	¹⁵²Sm	62	90	151.920	26.75	stable
Samarium 154	¹⁵⁴Sm	62	92	153.922	22.75	stable

Europium 151	¹⁵¹Eu	63	88	150.920	47.8	1.7 * 10¹⁸ a
Europium 153	¹⁵³Eu	63	90	152.921	52.2	stable

Gadolinium 150	¹⁵⁰Gd	64	86	149.919	-	1.8 * 10⁶ a
Gadolinium 152	¹⁵²Gd	64	88	151.920	0.20	1.08 * 10¹⁴ a
Gadolinium 154	¹⁵⁴Gd	64	90	153.921	2.18	stable
Gadolinium 155	¹⁵⁵Gd	64	91	154.923	14.80	stable
Gadolinium 156	¹⁵⁶Gd	64	92	155.922	20.47	stable
Gadolinium 157	¹⁵⁷Gd	64	93	156.924	15.65	stable
Gadolinium 158	¹⁵⁸Gd	64	94	157.924	24.84	stable
Gadolinium 160	¹⁶⁰Gd	64	96	159.927	21.86	1.3 * 10²¹ a

Terbium 159	¹⁵⁹Tb	65	94	158.925	100	stable

Dysprosium 154	¹⁵⁴Dy	66	88	153.924	-	3 * 10⁶ a
Dysprosium 156	¹⁵⁶Dy	66	90	155.924	0.06	stable
Dysprosium 158	¹⁵⁸Dy	66	92	157.924	0.1	stable
Dysprosium 160	¹⁶⁰Dy	66	94	159.925	2.34	stable
Dysprosium 161	¹⁶¹Dy	66	95	160.927	18.91	stable
Dysprosium 162	¹⁶²Dy	66	96	161.927	25.51	stable
Dysprosium 163	¹⁶³Dy	66	97	162.929	24.90	stable
Dysprosium 164	¹⁶⁴Dy	66	98	163.929	28.18	stable

Holmium 165	¹⁶⁵Ho	67	98	164.930	100	stable
Holmium 166	¹⁶⁶Ho	67	99	165.932	-	26.83 h
Holmium 166^m1	^166m1Ho	67	99		-	1200 a

Erbium 162	¹⁶²Er	68	94	161.929	0.14	stable
Erbium 164	¹⁶⁴Er	68	96	163.929	1.61	stable
Erbium 166	¹⁶⁶Er	68	98	165.930	33.6	stable
Erbium 167	¹⁶⁷Er	68	99	166.932	22.95	stable
Erbium 168	¹⁶⁸Er	68	100	167.932	26.8	stable
Erbium 170	¹⁷⁰Er	68	102	169.935	14.9	stable

Thulium 169	¹⁶⁹Tm	69	100	168.934	100	stable

Ytterbium 168	¹⁶⁸Yb	70	98	167.934	0.13	stable
Ytterbium 170	¹⁷⁰Yb	70	100	169.935	3.05	stable
Ytterbium 171	¹⁷¹Yb	70	101	170.936	14.3	stable
Ytterbium 172	¹⁷²Yb	70	102	171.936	21.9	stable
Ytterbium 173	¹⁷³Yb	70	103	172.938	16.12	stable
Ytterbium 174	¹⁷⁴Yb	70	104	173.939	31.8	stable
Ytterbium 176	¹⁷⁶Yb	70	106	175.943	12.7	stable

Lutetium 175	¹⁷⁵Lu	71	104	174.941	97.41	stable
Lutetium 176	¹⁷⁶Lu	71	105	175.943	2.59	3.78 * 10¹⁰ a

Hafnium 174	¹⁷⁴Hf	72	102	173.940	0.162	2 * 10¹⁵ a
Hafnium 176	¹⁷⁶Hf	72	104	175.941	5.206	stable
Hafnium 177	¹⁷⁷Hf	72	105	176.943	18.606	stable
Hafnium 178	¹⁷⁸Hf	72	106	177.944	27.297	stable
Hafnium 178^m2	^178m2Hf	72	106		-	31.1 a
Hafnium 179	¹⁷⁹Hf	72	107	178.946	13.629	stable
Hafnium 180	¹⁸⁰Hf	72	108	179.947	35.1	stable

Tantalum 180	¹⁸⁰Ta	73	107	179.947	-	8.125 h
Tantalum 180^m	^180mTa	73	107		0.012	>2 * 10¹⁶ a
Tantalum 181	¹⁸¹Ta	73	108	180.948	99.988	stable

Tungsten 180	¹⁸⁰W	74	106	179.947	0.13	1.8 * 10¹⁸ a
Tungsten 182	¹⁸²W	74	108	181.948	26.3	stable
Tungsten 183	¹⁸³W	74	109	182.950	14.3	stable
Tungsten 184	¹⁸⁴W	74	110	183.951	30.67	stable
Tungsten 186	¹⁸⁶W	74	112	185.954	28.6	stable

Rhenium 185	¹⁸⁵Re	75	110	184.953	37.4	stable
Rhenium 186	¹⁸⁶Re	75	111	185.955	-	3.719 d
Rhenium 186^m	^{186^m}Re	75	111		-	2 * 10⁵ a
Rhenium 187	¹⁸⁷Re	75	112	186.956	62.6	4.12 * 10¹⁰ a
Rhenium 188	¹⁸⁸Re	75	113	187.958	-	17 h

Osmium 184	¹⁸⁴Os	76	108	183.952	0.02	3 * 10¹³ a
Osmium 186	¹⁸⁶Os	76	110	185.954	1.58	2 * 10¹⁵ a
Osmium 187	¹⁸⁷Os	76	111	186.956	1.6	stable
Osmium 188	¹⁸⁸Os	76	112	187.956	13.3	stable
Osmium 189	¹⁸⁹Os	76	113	188.958	16.1	stable
Osmium 190	¹⁹⁰Os	76	114	189.958	26.4	stable
Osmium 192	¹⁹²Os	76	116	191.961	41.0	stable

Iridium 191	¹⁹¹Ir	77	114	190.961	37.3	stable
Iridium 192	¹⁹²Ir	77	115	191.963	-	73.827 d
Iridium 192^m2	^192m2Ir	77	115		-	241 a
Iridium 193	¹⁹³Ir	77	116	192.963	62.7	stable

Platinum 190	¹⁹⁰Pt	78	112	189.960	0.01	6.5 * 10¹¹ a
Platinum 192	¹⁹²Pt	78	114	191.961	0.79	stable
Platinum 194	¹⁹⁴Pt	78	116	193.963	32.9	stable
Platinum 195	¹⁹⁵Pt	78	117	194.965	33.8	stable
Platinum 196	¹⁹⁶Pt	78	118	195.965	25.3	stable
Platinum 198	¹⁹⁸Pt	78	120	197.968	7.2	stable

Gold 197	¹⁹⁷Au	79	118	196.967	100	stable
Gold 198	¹⁹⁸Au	79	119	197.968	-	2.695 d

Mercury 196	¹⁹⁶Hg	80	116	195.966	0.15	stable
Mercury 198	¹⁹⁸Hg	80	118	197.967	9.97	stable
Mercury 199	¹⁹⁹Hg	80	119	198.968	16.87	stable
Mercury 200	²⁰⁰Hg	80	120	199.968	23.1	stable
Mercury 201	²⁰¹Hg	80	121	200.970	13.18	stable
Mercury 202	²⁰²Hg	80	122	201.971	29.86	stable
Mercury 204	²⁰⁴Hg	80	124	203.973	6.87	stable
Mercury 206	²⁰⁶Hg	80	126	205.978	*	8.15 min

Thallium 201	²⁰¹Tl	81	120	200.971	-	72.912 h
Thallium 203	²⁰³Tl	81	122	202.973	29.524	stable
Thallium 205	²⁰⁵Tl	81	124	204.974	70.476	stable
Thallium 206	²⁰⁶Tl	81	125	205.976	*	4.199 min
Thallium 207	²⁰⁷Tl	81	126	206.977	*	4.77 min
Thallium 208	²⁰⁸Tl	81	127	207.982	*	3.053 min
Thallium 209	²⁰⁹Tl	81	128	208.985	*	2.161 min
Thallium 210	²¹⁰Tl	81	129	209.990	*	1.30 min

Lead 204	²⁰⁴Pb	82	122	203.973	1.4	>1.4 * 10¹⁷ a
Lead 206	²⁰⁶Pb	82	124	205.974	24.1	stable
Lead 207	²⁰⁷Pb	82	125	206.976	22.1	stable
Lead 208	²⁰⁸Pb	82	126	207.977	52.4	stable
Lead 209	²⁰⁹Pb	82	127	208.981	*	3.253 h
Lead 210	²¹⁰Pb	82	128	209.984	*	22.3 a
Lead 211	²¹¹Pb	82	129	210.989	*	36.1 min
Lead 212	²¹²Pb	82	130	211.992	*	10.64 h
Lead 214	²¹⁴Pb	82	132	214.000	*	26.8 min

Bismuth 209	²⁰⁹Bi	83	126	208.980	100	1.9 * 10¹⁹ a
Bismuth 210	²¹⁰Bi	83	127	209.984	*	5.013 d
Bismuth 210^m	^210mBi	83	127		-	304600 a
Bismuth 211	²¹¹Bi	83	128	210.987	*	2.14 min
Bismuth 212	²¹²Bi	83	129	211.991	*	60.55 min
Bismuth 213	²¹³Bi	83	130	212.994	*	49.59 min
Bismuth 214	²¹⁴Bi	83	131	213.999	*	19.9 min
Bismuth 215	²¹⁵Bi	83	132	215.002	*	7.6 min

Polonium 209	²⁰⁹Po	84	125	208.982	-	103 a
Polonium 210	²¹⁰Po	84	126	209.983	99.998	138.376 d
Polonium 211	²¹¹Po	84	127	210.987	*	0.516 s
Polonium 212	²¹²Po	84	128	211.989	*	304 ns
Polonium 213	²¹³Po	84	129	212.993	*	4 μs
Polonium 214	²¹⁴Po	84	130	213.995	*	164 μs
Polonium 215	²¹⁵Po	84	131	214.999	*	1.781 ms
Polonium 216	²¹⁶Po	84	132	216.002	*	0.15 s
Polonium 218	²¹⁸Po	84	134	218.009	0.002	3.05 min

Astatine 209	²⁰⁹At	85	124	208.986	-	5.41 h
Astatine 210	²¹⁰At	85	125	209.987	-	8.3 h
Astatine 211	²¹¹At	85	126	210.987	-	7.214 h
Astatine 215	²¹⁵At	85	130	214.999	*	0.10 ms
Astatine 217	²¹⁷At	85	132	217.005	*	32.3 ms
Astatine 218	²¹⁸At	85	133	218.009	*	1.5 s
Astatine 219	²¹⁹At	85	134	219.011	*	56 s

Radon 218	²¹⁸Rn	86	132	218.006	*	35 ms
Radon 219	²¹⁹Rn	86	133	219.009	1	3.96 s
Radon 220	²²⁰Rn	86	134	220.011	9	55.6 s
Radon 222	²²²Rn	86	136	222.018	90	3.824 d

Francium 221	²²¹Fr	87	134	221.014	*	4.9 min
Francium 223	²²³Fr	87	136	223.020	100	21.8 min

Radium 221	²²¹Ra	88	133	221.014	*	28 s
Radium 223	²²³Ra	88	135	223.019	*	11.435 d
Radium 224	²²⁴Ra	88	136	224.020	*	3.66 d
Radium 225	²²⁵Ra	88	137	225.024	*	14.9 d
Radium 226	²²⁶Ra	88	138	226.025	100	1602 a
Radium 228	²²⁸Ra	88	140	228.031	*	5.7 a

Actinium 225	²²⁵Ac	89	136	225.023	*	10 d
Actinium 227	²²⁷Ac	89	138	227.028	100	21.773 a
Actinium 228	²²⁸Ac	89	139	228.031	*	6.15 h

Thorium 227	²²⁷Th	90	137	227.028	*	18.72 d
Thorium 228	²²⁸Th	90	138	228.029	*	1.9131 a
Thorium 229	²²⁹Th	90	139	229.032	*	7917 a
Thorium 230	²³⁰Th	90	140	230.033	0.02	75380 a
Thorium 231	²³¹Th	90	141	231.036	*	25.52 h
Thorium 232	²³²Th	90	142	232.038	99.98	1.405 * 10¹⁰ a
Thorium 234	²³⁴Th	90	144	234.044	*	24.10 d

Protactinium 231	²³¹Pa	91	140	231.036	100	32760 a
Protactinium 233	²³³Pa	91	142	233.040	*	26.975 d
Protactinium 234	²³⁴Pa	91	143	234.043	*	6.70 h
Protactinium 234^m	^234mPa	91	143		*	1.17 min

Uranium 233	²³³U	92	141	233.040	*	159220 a
Uranium 234	²³⁴U	92	142	234.041	0.0055	245560 a
Uranium 235	²³⁵U	92	143	235.044	0.72	7.038 * 10⁸ a
Uranium 236	²³⁶U	92	144	236.046	*	2.342 * 10⁷ a
Uranium 237	²³⁷U	92	145	237.049	*	6.752 d
Uranium 238	²³⁸U	92	146	238.051	99.27	4.468 * 10⁹ a
Uranium 240	²⁴⁰U	92	148	240.057	*	14.1 h

Neptunium 236	²³⁶Np	93	143	236.047	-	154600 a
Neptunium 237	²³⁷Np	93	144	237.048	100	2.1447 * 10⁶ a
Neptunium 239	²³⁹Np	93	146	239.053	*	2.356 d
Neptunium 240	²⁴⁰Np	93	147	240.056	*	61.9 min

Plutonium 238	²³⁸Pu	94	144	238.050	*	87.7 a
Plutonium 239	²³⁹Pu	94	145	239.052	*	24110 a
Plutonium 240	²⁴⁰Pu	94	146	240.054	*	6564 a
Plutonium 241	²⁴¹Pu	94	147	241.057	-	14.29 a
Plutonium 242	²⁴²Pu	94	148	242.059	-	375000 a
Plutonium 244	²⁴⁴Pu	94	150	244.064	100	8.0 * 10⁷ a

Americium 241	²⁴¹Am	95	146	241.057	-	432.2 a
Americium 242	²⁴²Am	95	147	242.060	-	16.02 h
Americium 242^m1	^242m1Am	95	147		-	141 a
Americium 243	²⁴³Am	95	148	243.061	-	7370 a

Curium 242	²⁴²Cm	96	146	242.059	-	162.8 d
Curium 244	²⁴⁴Cm	96	148	244.063	-	18.1 a
Curium 247	²⁴⁷Cm	96	151	247.070	-	1.56 * 10⁷ a
Curium 248	²⁴⁸Cm	96	152	248.072	-	348600 a

Berkelium 247	²⁴⁷Bk	97	150	247.070	-	1380 a
Berkelium 248	²⁴⁸Bk	97	151	248.073	-	9.5 a
Berkelium 249	²⁴⁹Bk	97	152	249.075	-	330 d

Californium 249	²⁴⁹Cf	98	151	249.075	-	351 a
Californium 250	²⁵⁰Cf	98	152	250.076	-	13.08 a
Californium 251	²⁵¹Cf	98	153	251.080	-	900 a
Californium 252	²⁵²Cf	98	154	252.082	-	2.645 a

Einsteinium 252	²⁵²Es	99	153	252.083	-	471.7 d
Einsteinium 253	²⁵³Es	99	154	253.085	-	20.47 d
Einsteinium 254	²⁵⁴Es	99	155	254.089	-	275.7 d
Einsteinium 255	²⁵⁵Es	99	156	255.090	-	39.8 d

Fermium 253	²⁵³Fm	100	153	253.085	-	3.00 d
Fermium 254	²⁵⁴Fm	100	154	254.087	-	3.240 h
Fermium 255	²⁵⁵Fm	100	155	255.090	-	20.07 h
Fermium 257	²⁵⁷Fm	100	157	257.095	-	100.5 d

Mendelevium 256	²⁵⁶Md	101	155	256.094	-	77 min
Mendelevium 258	²⁵⁸Md	101	157	258.098	-	51.5 d
Mendelevium 260	²⁶⁰Md	101	159	260.104	-	27.8 d

Nobelium 255	²⁵⁵No	102	153	255.093	-	3.1 min
Nobelium 257	²⁵⁷No	102	155	257.097	-	25 s
Nobelium 259	²⁵⁹No	102	157	259.101	-	58 min

Lawrencium 262	²⁶²Lr	103	159	262.110	-	3.6 h
Lawrencium 264	²⁶⁴Lr	103	161	264.114	-	3 h
Lawrencium 266	²⁶⁶Lr	103	163	266.120	-	11 h

Rutherfordium 267	²⁶⁷Rf	104	163	267.122	-	2.5 h

Dubnium 268	²⁶⁸Db	105	163	268.126	-	30 h

Seaborgium 269	²⁶⁹Sg	106	163	269.129	-	14 min

Bohrium 267	²⁶⁷Bh	107	160	267.128	-	17 s

Hassium 269	²⁶⁹Hs	108	161	269.134	-	10 s
Hassium 277	²⁷⁷Hs	108	169	277.152	-	12 ms
Hassium 277^m	^277mHs	108	169		-	2.2 min

Meitnerium 278	²⁷⁸Mt	109	169	278.156	-	7.6 s

Darmstadtium 281	²⁸¹Ds	110	171	281.165	-	10 s

Roentgenium 282	²⁸²Rg	111	171	282.169	-	2.1 min

Copernicium 285	²⁸⁵Cn	112	173	285.177	-	30 s

Nihonium 286	²⁸⁶Nh	113	173	286.182	-	9.5 s

Flerovium 289	²⁸⁹Fl	114	175	289.190	-	2 s

Moscovium 290	²⁹⁰Mc	115	175	290.196	-	0.65 s

Livermorium 292	²⁹²Lv	116	176	292.202	-	16 ms
Livermorium 293	²⁹³Lv	116	177	293.204	-	53 ms

Tennessine 293	²⁹³Ts	117	176	293.208	-	14 ms
Tennessine 294	²⁹⁴Ts	117	177	294.210	-	78 ms

Oganesson 294	²⁹⁴Og	118	176	294.214	-	0.7 ms

Except for the isotope hydrogen 1 (and the extremely unstable Helium 2), all isotopes contain neutrons. For stable isotopes, the number of neutrons increases more with the number of protons, so that large isotopes have more neutrons than protons. Put simply, the greater the number of protons, the greater the ratio of the number of neutrons to protons. The largest isotope with the same number of neutrons and protons is calcium 40. Isotopes with an even number of protons and an even number of neutrons tend to be more stable than others. Isotopes in which the number of protons and neutrons corresponds to a so-called magic number are particularly stable, these are the numbers 2, 8, 20, 28, 50, 82, 126 and 184.

No responsibility is taken for the correctness of this information.

German: Chemie-Rechner

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