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This type is for atoms of chemical elements with specific combinations of the numbers of protons and neutrons in the nucleus.
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3,177 Isotope topics matching:
Filter this Collection| u | |||||
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| x name | x image | x Isotope of | x Mass number | x Mass | x article |
| x Mass (u) | |||||
| x Copernicium-277 | Copernicium | 277 | 277.16394 u | ||
| x Hydrogen-1 | Hydrogen | 1 | 1.00783 u | ||
| x Thorium-230 | Thorium | 230 | 230.03313 u |
Although thorium (Th) has 6 naturally occurring isotopes, none of these isotopes are stable; however, one isotope, Th, is relatively stable, with a half-life of 14.05 billion years, considerably longer than the age of the earth, and even slightly...
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| x Americium-242 | Americium | 242 | 242.05955 u |
Americium-242m is one of the isotopes of americium, with 95 protons and electrons and 147 neutrons and a mass of 242.0595492 g/mol. It is one of the rare cases, like tantalum-180m, where a higher-energy nuclear isomer is more stable than the lower...
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| x Americium-243 | Americium | 243 | 243.06138 u |
Americium-243 is a radioactive isotope of americium having 95 electrons and protons and 148 neutrons and has a mass of 243.06138 g/mol.
It has a half-life of 7370 years, the longest lasting of all americium isotopes, however, it is still not found...
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| x Plutonium-241 | Plutonium | 241 | 241.05685 u |
Plutonium-241 (Pu-241) is an isotope of plutonium formed when plutonium-240 captures a neutron. Like Pu-239 but unlike Pu, Pu is fissile, with a neutron absorption cross section about 1/3 greater than Pu, and a similar probability of fissioning on...
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| x Uranium-236 | Uranium | 236 | 236.04557 u |
Uranium-236 is an isotope of Uranium that is neither fissile with thermal neutrons, nor very good fertile material, but is generally considered a nuisance and long-lived radioactive waste. It is found in spent nuclear fuel and in the reprocessed...
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| x Uranium-234 | Uranium | 234 | 234.04095 u |
Uranium-234 is an isotope of uranium. In natural uranium and in uranium ore, U-234 occurs as an indirect decay product of uranium-238, but it makes up only 0.0055% (55 parts per million) of the raw uranium because its half-life of just 245,500 years...
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| x Thorium-232 | Thorium | 232 | 232.03806 u |
As Thorium is mononuclidic, the main article on thorium effectively discusses this isotope.
Thorium-232 is the only primordial isotope of thorium and makes up effectively all of natural thorium, with other isotopes of thorium appearing only in trace...
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| x Plutonium-239 | Plutonium | 239 | 239.05216 u |
Plutonium-239 is an isotope of plutonium. Plutonium-239 is the primary fissile isotope used for the production of nuclear weapons, although uranium-235 has also been used and is currently the secondary isotope. Plutonium-239 is also one of the three...
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| x Plutonium-238 |
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Plutonium | 238 | 238.04956 u |
Plutonium-238, is a radioactive isotope of plutonium with a half-life of 87.7 years. Because it is a very powerful alpha emitter that does not emit significant amounts of other, more penetrating and thus more problematic radiation, this isotope is...
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| x Uranium-235 |
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Uranium | 235 | 235.04393 u |
Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238 it is fissile, i.e., it can sustain fission chain reaction. It is the only fissile isotope that is a primordial nuclide or...
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| x Uranium-238 |
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Uranium | 238 | 238.05079 u |
Uranium-238 (U or U-238) is the most common isotope of uranium found in nature. It is not fissile, but is a fertile material: it can capture a slow neutron and after two beta decays become fissile plutonium-239. U is fissionable by fast neutrons,...
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| x Uranium-232 | Uranium | 232 | 232.03716 u |
Uranium (U) is a naturally occurring radioactive element that has no stable isotopes but two primordial isotopes (uranium-238 and uranium-235) that have long half-life and are found in appreciable quantity in the Earth's crust, along with the decay...
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| x Hydrogen-6 | Hydrogen | 6 | 6.04494 u | ||
| x Hydrogen-7 | Hydrogen | 7 | 7.05275 u | ||
| x Uranium-233 | Uranium | 233 | 233.03964 u |
Uranium-233 is a fissile isotope of uranium that is bred from thorium-232 as part of the thorium fuel cycle. Uranium-233 was investigated for use in nuclear weapons and as a reactor fuel; however, it was never deployed in nuclear weapons or used...
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| x Plutonium-240 | Plutonium | 240 | 240.05381 u |
Plutonium-240 (Pu-240) is an isotope of the metal plutonium formed when plutonium-239 captures a neutron. About 62% to 73% of the time when Pu-239 captures a neutron it undergoes fission; the rest of the time it forms Pu-240. The longer a nuclear...
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| x Deuterium |
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Hydrogen | 2 | 2.0141 u |
Deuterium, also called heavy hydrogen, is one of two stable isotopes of hydrogen. It has a natural abundance in Earth's oceans of about one atom in 6,420 of hydrogen (~156.25 ppm on an atom basis). Deuterium accounts for approximately 0.0156% (or on...
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| x Carbon-13 | Carbon | 13 | 13.00335 u |
Carbon-13 (C) is a natural, stable isotope of carbon and one of the environmental isotopes. It makes up about 1.1% of all natural carbon on Earth.
A mass spectrum of an organic compound will usually contain a small peak of one mass unit greater than...
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| x Carbon-14 | Carbon | 14 | 14.00324 u |
Carbon-14, C, or radiocarbon, is a radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons. Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949), to...
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| x Uranium-241 |
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Uranium | 241 | 241.06033 u |
Uranium-241 is an isotope of Uranium with a half life of approximately 5 minutes.
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| x Helium-3 | Helium | 3 | 3.01603 u |
Helium-3 (He-3, sometimes called tralphium) is a light, non-radioactive isotope of helium with two protons and one neutron. It is rare on Earth, and is sought for use in nuclear fusion research. The abundance of helium-3 is thought to be greater on...
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| x Helium-4 | Helium | 4 | 4.0026 u |
Helium-4 (4
2He or 4He) is a non-radioactive isotope of helium. It is by far the most abundant of the two naturally occurring isotopes of helium, making up about 99.99986% of the helium on earth. Its nucleus is the same as an alpha particle,...
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| x Lithium-7 | Lithium | 7 | 7.016 u | ||
| x Lithium-6 | Lithium | 6 | 6.01512 u | ||
| x Beryllium-9 | Beryllium | 9 | 9.01218 u | ||
| x Beryllium-7 | Beryllium | 7 | 7.01693 u | ||
| x Beryllium-10 | Beryllium | 10 | 10.01353 u | ||
| x Boron-11 | Boron | 11 | 11.00931 u | ||
| x Boron-10 | Boron | 10 | 10.01294 u | ||
| x Nitrogen-16 | Nitrogen | 16 | 16.0061 u | ||
| x Nitrogen-15 | Nitrogen | 15 | 15.00011 u |
Natural Nitrogen (N) consists of two stable isotopes, nitrogen-14, which makes up the vast majority of naturally occurring nitrogen, and nitrogen-15. Fourteen radioactive isotopes (radioisotopes) have also been found so far, with atomic masses...
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| x Nitrogen-14 | Nitrogen | 14 | 14.00307 u |
Nitrogen-14 is one of two stable (non-radioactive) isotopes of the chemical element nitrogen, making up 99.636% of natural nitrogen.
It is one of the few stable nuclides with both an odd number of protons and neutrons (7 each) each of which...
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| x Nitrogen-13 | Nitrogen | 13 | 13.00574 u |
Nitrogen-13 is a radioisotope of nitrogen used in positron emission tomography (PET). It has a half life of a little under ten minutes, so it must be made at the PET site. A cyclotron may be used for this purpose.
Nitrogen-13 is used to tag ammonia...
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| x Oxygen-15 | Oxygen | 15 | 15.00307 u | ||
| x Oxygen-16 | Oxygen | 16 | 15.99491 u | ||
| x Oxygen-17 | Oxygen | 17 | 16.99913 u | ||
| x Oxygen-18 | Oxygen | 18 | 17.99916 u |
Oxygen-18 (O) is a natural, stable isotope of oxygen and one of the environmental isotopes.
O is an important precursor for the production of fluorodeoxyglucose (FDG) used in positron emission tomography (PET). Generally, in the radiopharmaceutical...
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| x Argon-38 | Argon | 38 | 37.96273 u | ||
| x Argon-39 | Argon | 39 | 38.96431 u | ||
| x Argon-40 | Argon | 40 | 39.96238 u | ||
| x Argon-41 | Argon | 41 | 40.9645 u | ||
| x Argon-36 | Argon | 36 | 35.96755 u | ||
| x Argon-37 | Argon | 37 | 36.96678 u | ||
| x Argon-42 | Argon | 42 | 41.96305 u | ||
| x Selenium-77 | Selenium | 77 | 76.91991 u | ||
| x Selenium-76 | Selenium | 76 | 75.91921 u | ||
| x Selenium-79 | Selenium | 79 | 78.9185 u | ||
| x Selenium-78 | Selenium | 78 | 77.91731 u | ||
| x Selenium-81 | Selenium | 81 | 80.91799 u | ||
| x Selenium-80 | Selenium | 80 | 79.91652 u | ||
| x Selenium-72 | Selenium | 72 | 71.92711 u | ||
| x Selenium-82 | Selenium | 82 | 81.9167 u | ||
| x Selenium-75 | Selenium | 75 | 74.92252 u | ||
| x Selenium-74 | Selenium | 74 | 73.92248 u | ||
| x Xenon-134 | Xenon | 134 | 133.90539 u | ||
| x Xenon-133 | Xenon | 133 | 132.90591 u | ||
| x Xenon-132 | Xenon | 132 | 131.90415 u | ||
| x Xenon-131 | Xenon | 131 | 130.90508 u | ||
