According to https://en.wikipedia.org/wiki/Synthetic_element , all stable isotopes created artificially can also be found in nature (I don't have a more reliable source). (stackexchange.com)
begingroup$ @MartinKochanski: Technically, yes, this quote does not fully eliminate stable isotopes not occurring in nature (although it does touch the question, at least in the part related to the 24 synthetic elements not occurring in nature: if an element is unstable, that means all its isotopes are unstable). (stackexchange.com)
Partition of anions and their stable isotopes in coral skeleton enables the reconstruction of past seawater carbonate chemistry, paleo-CO2, and past climates. (bvsalud.org)
Uranium14
Uranium is among the more common elements in the earth's crust - about 500 times more common than gold. (iaea.org)
U-238 makes up over 99% of the 3 naturally occurring isotopes of uranium on Earth. (iaea.org)
There are three natural isotopes of uranium - uranium-234 (U-234), uranium-235 (U-235) and uranium-238 (U-238). (iaea.org)
Most nuclear reactors use fuels containing U-235, however, natural uranium typically contains only 0.72 per cent of U-235 and, most reactors need a higher concentration of this isotope in their fuel. (iaea.org)
Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. (viking.nu)
Uranium metal is about 60 percent denser than lead and almost as dense as gold. (wyo.gov)
Naturally occurring uranium consists primarily of three isotopes (atoms with the same number of protons but a different number of neutrons). (wyo.gov)
The most abundant uranium isotope is 238 U (which has 146 neutrons and 92 protons in the nucleus), followed by 235 U (which has 143 neutrons and 92 protons in the nucleus) and trace amounts of 234 U (which has 142 neutrons and 92 protons in the nucleus). (wyo.gov)
Other isotopes of uranium are known but very rare, and usually short lived. (wyo.gov)
All isotopes of uranium are radioactive, meaning their nuclei are unstable and will decay over time. (wyo.gov)
Uranium isotopes must undergo multiple decay events before reaching a stable form in a process known as a decay series. (wyo.gov)
235 U is the only uranium isotope considered fissionable. (wyo.gov)
Those that do not exist in nature and were created by man, such as certain isotopes of Uranium. (crgsoft.com)
Such operational AI should prove even more relevant in nuclear medicine (NM), which deals with radioactive isotopes, whose shelf-life is limited. (springer.com)
Atoms3
Number of isotopes (atoms of the same element with a different number of neutrons): Between 18 and 59, depending on where the line for an isotope is drawn. (livescience.com)
With gold atoms there can be some covalent interaction. (wikipedia.org)
Yes, there are isotopes which would be stable if any atoms of them existed, and we can make them in the laboratory, but conditions in nature have never led to them being created. (stackexchange.com)
Naturally3
Most common isotopes: Au-197, which makes up 100 percent of naturally occurring gold. (livescience.com)
Seven other elements were first created artificially and thus considered synthetic, but later discovered to exist naturally (in trace quantities) as well' - they say that the 24 elements are all unstable, whereas the other 7 occur in nature. (stackexchange.com)
Radionuclides occur naturally or are artificially produced in nuclear reactors , cyclotrons , particle accelerators or radionuclide generators . (wikipedia.org)
Unstable2
But consider another (imaginary) stable isotope - call it X - which requires more kinetic energy for its creation and is also more unstable to photodissociation. (stackexchange.com)
A radionuclide ( radioactive nuclide , radioisotope or radioactive isotope ) is a nuclide that has excess nuclear energy, making it unstable. (wikipedia.org)
Microseconds1
Many artificially created gold isotopes are stable for microseconds or milliseconds before decaying into other elements. (livescience.com)
Abundant1
ArH+ + eā ā ArH* ā Ar + H Artificial ArH+ made from earthly Ar contains mostly the isotope 40Ar rather than the cosmically abundant 36Ar. (wikipedia.org)
Reactors1
Some heavy elements are produced in reactors, and some are produced artificially in cyclotron experiments. (llnl.gov)
Heavier4
Gold, and other elements heavier than iron, are formed just before stars explode into supernovae. (livescience.com)
Heavier elements are formed during the incredible energy generated during this process, including gold. (livescience.com)
This gas is then pumped into fast spinning cylinders - centrifuges - where heavier isotopes, such as U-238, are pushed towards the walls of the cylinders, and the lighter U-235 stays in the centre of the cylinders. (iaea.org)
In theory, elements heavier than dysprosium exist only as radionuclides, but some such elements, like gold and platinum , are observationally stable and their half-lives have not been determined). (wikipedia.org)
Decay1
The 235 U decay series ends when the stable 207 Lead isotope is produced. (wyo.gov)
Particle1
The best answer will tell me the kind of isotope, element, particle or some other thing that will get us to number 1, 2, and 3. (stackexchange.com)
Thorium1
Some can be made artificially, such as 239 U, which is produced during the process of converting 238 U to 239 Plutonium, while 232 Thorium can be converted to 233 U. (wyo.gov)
Carbon1
This gave an artificially high carbon-14 reading for the anthracite. (stackexchange.com)
Elements5
Gold, the 79th element on the Periodic Table of the Elements , is one of the more recognizable of the bunch. (livescience.com)
Gold represents a tiny fraction of the elements in the known universe. (livescience.com)
That Wikipedia article talks about elements, not isotopes, so it doesn't really touch the question. (stackexchange.com)
The extraction or obtaining of a raw material can be in different ways , since mineral elements must be mined, synthetics produced artificially, etc. (crgsoft.com)
There are certain elements, isotopes and particles that are extremely rare on Earth, such as Hel-3. (stackexchange.com)
Nuclear2
NUCLEAR MASS: Allowable in 60 kg but isotopes known from 40 to 250 kg. (iobit.com)
In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. (periodic-table.org)
Half-lives3
Because 234 U and 235 U have relatively short half-lives, the relative abundance of these isotopes has decreased compared to 238 U since the formation of the Earth. (wyo.gov)
Most of those are only produced artificially, and have very short half-lives. (wikipedia.org)
There are 22 other artificial isotopes, all radioactive and having very short half-lives. (ontologyportal.org)
Copper1
Examples of alloys are brass (copper and zinc), bronze (mainly copper and tin), and white gold (gold and usually nickel, manganese, or palladium). (biologyonline.com)
Element6
The element gold is a pirate's booty and an ingredient in microcircuits. (livescience.com)
Gold is an element that bridges old and new - and myth and science - seamlessly. (livescience.com)
But there was also a shiny yellow metal that came running down the river, the element of gold. (livescience.com)
EDIT(06/07/2016): see also the table of natural abundance of stable nuclides at https://www.ncsu.edu/chemistry/msf/pdf/IsotopicMass_NaturalAbundance.pdf (if an element does not have stable nuclides, they give data for the longest-living isotope). (stackexchange.com)
An isotope refers to any of the different forms of an element (thus, having the same number of protons) but having a different number of neutrons within their nuclei. (biologyonline.com)
Sodium is a pure element whose only stable isotope 23 is Na. (zxc.wiki)
Years2
The most stable isotope, Ac-227, has a half-life of 217 years. (ontologyportal.org)
Am-243 is the most stable isotope, with a half-life of 7.95*10^3 years. (ontologyportal.org)
Chemical1
CHEMICAL OWNERSHIP: Very big affinity for gold, silver, platinum and all noble metals. (iobit.com)
Made1
Artificially it is made by an electric discharge through an argon-hydrogen mixture. (wikipedia.org)
Makes1
Silver Age of GOLD Introduces New Features The Genomes OnLine Database makes curated microbiome metadata that follows community standards freely available and enables large-scale comparative genomics analysis initiatives. (doe.gov)
Nickel1
Rhodium occurs in small amounts in ores of other metals such as platinum , palladium , nickel , silver , and gold . (newworldencyclopedia.org)
High2
Redcon1's ISOTOPE 100% Whey Isolate 5lbs is the perfect choice if you're looking for a high-quality protein that tastes great and mixes easily. (bdsupplementstore.com)
Supercharging SIP in the Fungal Hyphosphere Applying high-throughput stable isotope probing to the study of a particular fungi, researchers identified novel interactions between bacteria and the fungi. (doe.gov)
Current1
While the USA had stopped producing tritium by about 1988 due to safety reasons and ageing facilities, the Indian breakthrough underscores the fact that tritium can now be produced at a fraction of the estimated US$ 7 billion needed to produce the isotope at current costs using the accelerator process, as was done in the USA. (ccnr.org)
Improve1
ISOTOPE is perfect for bodybuilders looking to improve their performance and build muscle. (bdsupplementstore.com)
Make1
was one of the first scientists to condemn alchemy, publicly demonstrating tricks used by alchemists to make people think they could make gold. (famousscientists.org)
STANDARD2
Download the Gold Standard MCAT Biochemistry Review Summary PDF or scroll down and click on an image below to view the summaries. (mcat-prep.com)
Unless mentioned otherwise, the following images are excerpts from the Gold Standard MCAT Biochemistry ebook. (mcat-prep.com)