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- Natural_abundance abstract "In physics, natural abundance (NA) refers to the abundance of isotopes of a chemical element as naturally found on a planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an isotope varies from planet to planet, and even from place to place on the Earth, but remains relatively constant in time (on a short-term scale).As an example, uranium has three naturally occurring isotopes: 238U, 235U and 234U. Their respective natural mole-fraction abundances are 99.2739–99.2752%, 0.7198–0.7202%, and 0.0050–0.0059%. For example, if 100,000 uranium atoms were analyzed, one would expect to find approximately 99,274 238U atoms, approximately 720 235U atoms, and very few (most likely 5 or 6) 234U atoms. This is because 238U is much more stable than 235U or 234U, as the half-life of each isotope reveals: 4.468×109 years for 238U compared to 7.038×108 years for 235U and 245,500 years for 234U.Exactly because the different uranium isotopes have different half-lives, when the Earth was younger, the isotopic composition of uranium was different. As an example, 1.7 billion years ago the NA of 235U was 3.1% compared to today's 0.7%, and for that reason a natural nuclear fission reactor was able to form, something that cannot happen today.However, the natural abundance of a given isotope is also affected by the probability of its creation in nucleosynthesis (as in the case of samarium; radioactive 147Sm and 148Sm are much more abundant than stable 144Sm) and by production of a given isotope by natural radioactive isotopes (as in the case of radiogenic isotopes of lead).".
- Natural_abundance thumbnail Relative_abundance_of_elements.png?width=300.
- Natural_abundance wikiPageExternalLink isotopes.htm.
- Natural_abundance wikiPageExternalLink molecule-tk.
- Natural_abundance wikiPageExternalLink exactmaa.htm.
- Natural_abundance wikiPageID "61648".
- Natural_abundance wikiPageLength "4318".
- Natural_abundance wikiPageOutDegree "19".
- Natural_abundance wikiPageRevisionID "677181296".
- Natural_abundance wikiPageWikiLink Abundance_of_the_chemical_elements.
- Natural_abundance wikiPageWikiLink Atomic_weight.
- Natural_abundance wikiPageWikiLink Category:Chemical_properties.
- Natural_abundance wikiPageWikiLink Category:Isotopes.
- Natural_abundance wikiPageWikiLink Chemical_element.
- Natural_abundance wikiPageWikiLink Half-life.
- Natural_abundance wikiPageWikiLink Isotope.
- Natural_abundance wikiPageWikiLink Isotopes_of_lead.
- Natural_abundance wikiPageWikiLink Mass-independent_fractionation.
- Natural_abundance wikiPageWikiLink Mole_fraction.
- Natural_abundance wikiPageWikiLink Natural_nuclear_fission_reactor.
- Natural_abundance wikiPageWikiLink Nucleosynthesis.
- Natural_abundance wikiPageWikiLink Periodic_table.
- Natural_abundance wikiPageWikiLink Physics.
- Natural_abundance wikiPageWikiLink Presolar_grains.
- Natural_abundance wikiPageWikiLink Relative_atomic_mass.
- Natural_abundance wikiPageWikiLink Samarium.
- Natural_abundance wikiPageWikiLink Uranium.
- Natural_abundance wikiPageWikiLink File:Relative_abundance_of_elements.png.
- Natural_abundance wikiPageWikiLinkText "Natural abundance".
- Natural_abundance wikiPageWikiLinkText "abundance".
- Natural_abundance wikiPageWikiLinkText "abundant".
- Natural_abundance wikiPageWikiLinkText "isotopic abundance".
- Natural_abundance wikiPageWikiLinkText "isotopic abundances".
- Natural_abundance wikiPageWikiLinkText "isotopic ratio".
- Natural_abundance wikiPageWikiLinkText "natural abundance".
- Natural_abundance wikiPageWikiLinkText "natural isotope mixture".
- Natural_abundance wikiPageWikiLinkText "natural isotopic abundance".
- Natural_abundance wikiPageWikiLinkText "naturally occurring mixture".
- Natural_abundance wikiPageWikiLinkText "naturally occurring".
- Natural_abundance wikiPageWikiLinkText "naturally".
- Natural_abundance hasPhotoCollection Natural_abundance.
- Natural_abundance wikiPageUsesTemplate Template:Reflist.
- Natural_abundance subject Category:Chemical_properties.
- Natural_abundance subject Category:Isotopes.
- Natural_abundance type Isotope.
- Natural_abundance type Physic.
- Natural_abundance type Property.
- Natural_abundance comment "In physics, natural abundance (NA) refers to the abundance of isotopes of a chemical element as naturally found on a planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for the element in the periodic table.".
- Natural_abundance label "Natural abundance".
- Natural_abundance sameAs Natuurlike_verspreiding.
- Natural_abundance sameAs Abundancia_natural.
- Natural_abundance sameAs وفرة_طبيعية.
- Natural_abundance sameAs Abondanza_natural.
- Natural_abundance sameAs Rasprostranjenost_u_prirodi.
- Natural_abundance sameAs Abundància_natural.
- Natural_abundance sameAs Naturlig_forekomst.
- Natural_abundance sameAs Natürliche_Häufigkeit.
- Natural_abundance sameAs Natura_abundeco.
- Natural_abundance sameAs Abundancia_natural.
- Natural_abundance sameAs Ugaritasun_natural.
- Natural_abundance sameAs فراوانی_طبیعی.
- Natural_abundance sameAs Abondance_naturelle.
- Natural_abundance sameAs Abundancia_natural.
- Natural_abundance sameAs Természetes_előfordulás.
- Natural_abundance sameAs Abbondanza_isotopica.
- Natural_abundance sameAs 天然存在比.
- Natural_abundance sameAs 자연_존재비.
- Natural_abundance sameAs Kelimpahan_semula_jadi.
- Natural_abundance sameAs Vörkamen_in_de_Natur.
- Natural_abundance sameAs Relatieve_aanwezigheid.
- Natural_abundance sameAs Naturlig_forekomst.
- Natural_abundance sameAs Abundancja_izotopu.
- Natural_abundance sameAs Abundância_natural.
- Natural_abundance sameAs m.0gppy.
- Natural_abundance sameAs Abundență_naturală.
- Natural_abundance sameAs Изотопная_распространённость.
- Natural_abundance sameAs Abbunnanza.
- Natural_abundance sameAs Pogostost_izotopa.
- Natural_abundance sameAs Ізотопна_поширеність.
- Natural_abundance sameAs Q659662.
- Natural_abundance sameAs Q659662.
- Natural_abundance sameAs 丰度.
- Natural_abundance wasDerivedFrom Natural_abundance?oldid=677181296.
- Natural_abundance depiction Relative_abundance_of_elements.png.
- Natural_abundance isPrimaryTopicOf Natural_abundance.