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1. Isotopes of neptunium: Neptunium (93Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Like all trace or artificial elements, it has no stable isotopes. (Artificial nuclides with atomic number of 93 but with different mass numbers) [100%] 2022-10-11 [Isotopes of neptunium] [Neptunium]...
2. Isotopes of neodymium: Naturally occurring neodymium (Nd) is composed of 5 stable isotopes, Nd, Nd, Nd, Nd and Nd, with Nd being the most abundant (27.2% natural abundance), and 2 radioisotopes, Nd and Nd. In all, 31 radioisotopes of Neodymium have been ... [100%] 2023-04-25 [Isotopes]
3. Isotopes of ununennium: Ununennium (119Uue) has not yet been synthesised, so all data would be theoretical and a standard atomic weight cannot be given. Like all synthetic elements, it would have no stable isotopes. (Physics) [100%] 2023-06-26 [Lists of isotopes by element]
4. Isotopes of lawrencium: Lawrencium (103Lr) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. (Nuclides with atomic number of 103 but with different mass numbers) [100%] 2022-08-31 [Isotopes of lawrencium] [Lawrencium]...
5. Isotopes of nihonium: Nihonium (113Nh) is a synthetic element. Being synthetic, a standard atomic weight cannot be given and like all artificial elements, it has no stable isotopes. (Physics) [100%] 2023-10-04 [Isotopes of nihonium] [Nihonium]...
6. Isotopes of thorium: Thorium (90Th) has seven naturally occurring isotopes but none are stable. One isotope, Th, is relatively stable, with a half-life of 1.405×10 years, considerably longer than the age of the Earth, and even slightly longer than the ... (Nuclides with atomic number of 90 but with different mass numbers) [100%] 2023-12-09 [Isotopes of thorium] [Thorium]...
7. Isotopes of iridium: There are two natural isotopes of iridium (77Ir), and 37 radioisotopes, the most stable radioisotope being Ir with a half-life of 73.83 days, and many nuclear isomers, the most stable of which is Ir with a half-life ... (Physics) [100%] 2023-04-15 [Isotopes of iridium] [Iridium]...
8. Isotopes of bohrium: Bohrium (107Bh) is an artificial element. Like all artificial elements, it has no stable isotopes. (Physics) [100%] 2022-08-18 [Isotopes of bohrium] [Lists of isotopes by element]...
9. Isotopes of chlorine: Chlorine (Cl) has isotopes with mass numbers ranging from 32 g mol to 40 g mol. There are two principal stable isotopes, Cl (75.77%) and Cl (24.23%), found in the relative proportions of 3:1 respectively, giving chlorine ... [100%] 2023-05-26 [Isotopes] [Chlorine]...
10. Isotopes of antimony: Antimony (51Sb) occurs in two stable isotopes, Sb and Sb. There are 35 artificial radioactive isotopes, the longest-lived of which are Sb, with a half-life of 2.75856 years; Sb, with a half-life of 60.2 days ... (Physics) [100%] 2023-12-26 [Isotopes of antimony] [Antimony]...
11. Isotopes of neodymium: Naturally occurring neodymium (60Nd) is composed of 5 stable isotopes, Nd, Nd, Nd, Nd and Nd, with Nd being the most abundant (27.2% natural abundance), and 2 long-lived radioisotopes, Nd and Nd. In all, 33 radioisotopes of neodymium ... (Physics) [100%] 2023-09-26 [Isotopes of neodymium] [Neodymium]...
12. Isotopes of rutherfordium: Rutherfordium (104Rf) is a synthetic element and thus has no stable isotopes. A standard atomic weight cannot be given. (Physics) [100%] 2022-11-24 [Isotopes of rutherfordium] [Lists of isotopes by element]...
13. Isotopes of osmium: Osmium (76Os) has seven naturally occurring isotopes, five of which are stable: Os, Os, Os, Os, and (most abundant) Os. The other natural isotopes, Os, and Os, have extremely long half-life (1.12×10 years and 2×10 years ... (Software) [100%] 2022-09-27 [Isotopes of osmium] [Osmium]...
14. Isotopes of holmium: Natural holmium (67Ho) contains one observationally stable isotope, Ho. The below table lists 36 isotopes spanning Ho through Ho as well as 33 nuclear isomers. (Physics) [100%] 2023-04-09 [Isotopes of holmium] [Holmium]...
15. Isotopes of polonium: Polonium (84Po) has 42 isotopes, all of which are radioactive, with between 186 and 227 nucleons. Po with a half-life of 138.376 days has the longest half-life of naturally occurring polonium and is also the most easily ... (Nuclides with atomic number of 84 but with different mass numbers) [100%] 2023-07-08 [Isotopes of polonium] [Polonium]...
16. Isotopes of barium: Naturally occurring barium (56Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks ... (Physics) [100%] 2023-11-15 [Isotopes of barium] [Lists of isotopes by element]...
17. Isotopes of gadolinium: Naturally occurring gadolinium (64Gd) is composed of 6 stable isotopes, Gd, Gd, Gd, Gd, Gd and Gd, and 1 radioisotope, Gd, with Gd being the most abundant (24.84% natural abundance). The predicted double beta decay of Gd has never ... (Physics) [100%] 2023-05-24 [Isotopes of gadolinium] [Gadolinium]...
18. Isotopes of promethium: Promethium (61Pm) is an artificial element, except in trace quantities as a product of spontaneous fission of U and U and alpha decay of Eu, and thus a standard atomic weight cannot be given. Like all artificial elements, it has ... (Physics) [100%] 2024-01-07 [Isotopes of promethium] [Lists of isotopes by element]...
19. Isotopes of lead: Editor-In-Chief: C. Michael Gibson, M.S., M.D. [100%] 2023-04-06 [Isotopes] [Lead]...
20. Isotopes of manganese: Naturally occurring manganese (25Mn) is composed of one stable isotope, Mn. 26 radioisotopes have been characterized, with the most stable being Mn with a half-life of 3.7 million years, Mn with a half-life of 312.3 days ... (Physics) [100%] 2023-07-04 [Isotopes of manganese] [Manganese]...
21. Isotopes of rhodium: Naturally occurring rhodium (45Rh) is composed of only one stable isotope, Rh. The most stable radioisotopes are Rh with a half-life of 3.3 years, Rh with a half-life of 207 days, and Rh with a half-life ... (Physics) [100%] 2022-08-04 [Isotopes of rhodium] [Lists of isotopes by element]...
22. Isotopes of thorium: Thorium (90Th) has seven naturally occurring isotopes but none are stable. One isotope, Th, is relatively stable, with a half-life of 1.405×10 years, considerably longer than the age of the Earth, and even slightly longer than the ... (Physics) [100%] 2023-12-05 [Isotopes of thorium] [Thorium]...
23. Isotopes of astatine: Astatine (85At) has 41 known isotopes, all of which are radioactive; their mass numbers range from 188 to 229 (though At is undiscovered). There are also 24 known metastable excited states. (Physics) [100%] 2023-11-01 [Isotopes of astatine] [Lists of isotopes by element]...
24. Isotopes of darmstadtium: Darmstadtium (110Ds) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. (Nuclides with atomic number of 110 but with different mass numbers) [100%] 2022-10-01 [Isotopes of darmstadtium] [Darmstadtium]...
25. Isotopes of krypton: There are 34 known isotopes of krypton (36Kr) with atomic mass numbers from 69 through 102. Naturally occurring krypton is made of five stable isotopes and one (Kr) which is slightly radioactive with an extremely long half-life, plus traces ... (Isotopes of the element Krypton) [100%] 2023-05-29 [Isotopes of krypton] [Krypton]...
26. Isotopes of iodine: There are 37 known isotopes of iodine (53I) from I to I; all undergo radioactive decay except I, which is stable. (Nuclides with atomic number of 53 but with different mass numbers) [100%] 2022-09-13 [Isotopes of iodine] [Iodine]...
27. Isotopes in medicine: A medical isotope is an isotope used in medicine. The first uses of isotopes in medicine were in radiopharmaceuticals, and this is still the most common use. (Medicine) [100%] 2023-09-14 [Medical isotopes] [Medicinal radiochemistry]...
28. Isotopes of oganesson: Oganesson (118Og) is a synthetic element created in particle accelerators, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. (Physics) [100%] 2023-03-02 [Isotopes of oganesson] [Lists of isotopes by element]...
29. Isotopes of argon: Argon (18Ar) has 26 known isotopes, from Ar to Ar and 1 isomer (Ar), of which three are stable (Ar, Ar, and Ar). On the Earth, Ar makes up 99.6% of natural argon. (Physics) [100%] 2023-01-30 [Isotopes of argon] [Lists of isotopes by element]...
30. Isotopes of lanthanum: Naturally occurring lanthanum (57La) is composed of one stable (La) and one radioactive (La) isotope, with the stable isotope, La, being the most abundant (99.91% natural abundance). There are 39 radioisotopes that have been characterized, with the most stable ... (Nuclides with atomic number of 57 but with different mass numbers) [100%] 2023-11-14 [Isotopes of lanthanum] [Lanthanum]...
31. Natural isotopes: Natural isotopes are either stable isotopes or radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (such as bismuth-209, with a half-life of 1.9×10 years ... [100%] 2023-10-27 [Isotopes]
32. Natural isotopes: Natural isotopes are either stable isotopes or radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (such as bismuth-209, with a half-life of 1.9×10 years ... [100%] 2024-01-26 [Isotopes]
33. Clumped isotopes: Clumped isotopes are heavy isotopes that are bonded to other heavy isotopes. The relative abundance of clumped isotopes (and multiply-substituted isotopologues) in molecules such as methane, nitrous oxide, and carbonate is an area of active investigation. (Physics) [100%] 2023-09-25 [Paleoclimatology] [Isotopes]...
34. Natural isotopes: Natural isotopes are either stable isotopes or radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (such as bismuth-209, with a half-life of 1.9×10 years ... (Physics) [100%] 2023-10-28 [Isotopes]
35. Environmental isotopes: The environmental isotopes are a subset of isotopes, both stable and radioactive, which are the object of isotope geochemistry. They are primarily used as tracers to see how things move around within the ocean-atmosphere system, within terrestrial biomes, within ... (Physics) [100%] 2023-09-14 [Environmental isotopes]