isotope

• To incorporate all of an element's isotopes in getting the element's atoms 'average atomic mass we must know the atomic mass units of each isotope, as well as its relative abundance among all the isotopes of the element. —  Citizendium, the Citizens' Compendium - Recent changes [en]
• Any country / corporation that gets a hold and controls that isotope will be able to control energy production on Earth for a long time. —  Council on Hemispheric Affairs
• And the reason they do this is, or the way they do this is, because they prefer to use the lightest sulfur isotope - sulfur 32, than the slightly heavier sulfur 34, because it works better in chemistry. —  ScreenTalk
• Strontium - a highly reactive chemical element whose radioactive isotope, strontium-90, is produced by nuclear fission. —  AfterDowningStreet.org - Bush-Cheney Trials in '09
• An isotope is a version of an element that has in its nucleus the typical protons for that element, but a different number of neutrons, thus exhibiting a different atomic weight. —  SpaceRef Top Stories

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