Nuclides predating the Earth's formation (found on Earth)
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Relative abundance of the chemical elements in the Earth's upper continental crust, on a per-atom basis
In geochemistry, geophysics and nuclear physics, primordial nuclides, also known as primordial isotopes, are nuclides found on Earth that have existed in their current form since before Earth was formed. Primordial nuclides were present in the interstellar medium from which the solar system was formed, and were formed in, or after, the Big Bang, by nucleosynthesis in stars and supernovae followed by mass ejection, by cosmic ray spallation, and potentially from other processes. They are the stable nuclides plus the long-lived fraction of radionuclides surviving in the primordial solar nebula through planet accretion until the present; 286 such nuclides are known.
and 24 Related for: Primordial nuclide information
geochemistry, geophysics and nuclear physics, primordialnuclides, also known as primordial isotopes, are nuclides found on Earth that have existed in their...
that have one or more stable isotopes. See stable nuclide and primordialnuclide. Unstable nuclides are radioactive and are called radionuclides. Their...
with sufficiently long half-lives (also known) to occur primordially. If the half-life of a nuclide is comparable to, or greater than, the Earth's age (4...
Chronology of the universe Primordial soup, hypothetical conditions under which life on Earth may have begun Primordialnuclide, nuclides, a few radioactive,...
cosmogenic nuclides. Some of these radionuclides are tritium, carbon-14 and phosphorus-32. Certain light (low atomic number) primordialnuclides (isotopes...
occurring nuclides on Earth, of which 286 are primordialnuclides, meaning that they have existed since the Solar System's formation. Primordialnuclides include...
A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess numbers of either neutrons or protons, giving it...
occurring nuclides comprise the radioactive primordialnuclides. The total number of primordialnuclides is then 251 (the stable nuclides) plus the 35...
This list of nuclides shows observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour. This represents isotopes...
nuclides have a neutron number of 19, 21, 35, 39, 45, 61, 89, 115, 123, or ≥ 127. There are 6 stable nuclides and one radioactive primordialnuclide with...
204Pb, 206Pb, 207Pb, 208Pb. Lead-204 is entirely a primordialnuclide and is not a radiogenic nuclide. The three isotopes lead-206, lead-207, and lead-208...
radiogenic nuclide is a nuclide that is produced by a process of radioactive decay. It may itself be radioactive (a radionuclide) or stable (a stable nuclide)....
System. This collection of 286 nuclides are known as primordialnuclides. Finally, an additional 53 short-lived nuclides are known to occur naturally,...
in the Big Bang are on the order of: lithium-7 to be 10−9 of all primordialnuclides; and lithium-6 around 10−13. The theory of BBN gives a detailed mathematical...
decayed to virtually zero abundance and is no longer detectable as a primordialnuclide. Extinct radionuclides were generated by various processes in the...
radioactive isotope rhenium-187 Gold-197 Primordialnuclide List of nuclides (sorted by half-life) Table of nuclides Isotope geochemistry Radionuclide Mononuclidic...
known isomers, but only one of these isotopes (9 Be ) is stable and a primordialnuclide. As such, beryllium is considered a monoisotopic element. It is also...
formation determines whether nuclides formed by cosmic ray spallation are termed primordial or are termed cosmogenic (a nuclide cannot belong to both classes)...
of 15.7 million years, which is far too short for it to exist as a primordialnuclide. Cosmogenic sources of 129I produce very tiny quantities of it that...
145 stable even–even nuclides, forming ~58% of the 251 stable nuclides. There are also 22 primordial long-lived even–even nuclides. As a result, many of...
half-lives for all other such nuclides with A ≤ 209, which are very long. (Such nuclides with A ≤ 209 are primordialnuclides except 146Sm.) Working out...
elements occurring naturally in the universe as stable isotopes and primordialnuclide, from carbon to uranium. These occurred after the Big Bang, during...
numbers of observationally stable nuclides exist for isotones 50 (five: 86Kr, 88Sr, 89Y, 90Zr, 92Mo – noting also the primordial radionuclide 87Rb) and 82 (six:...
found radioactive), and one very long-lived radioisotope (96Zr), a primordialnuclide that decays via double beta decay with an observed half-life of 2...
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