An isotope is an atom which is related to an element by the number of protons in the nucleus, and differs by the number of neutrons. Thus, they vary in physical properties, but all have very similar chemical properties, and electronic structure. The relative atomic mass of an element is configured using isotopes. It is the average atomic mass of all the element's isotopes. Therefore, if one isotope among all the others has an atomic …showed first 75 words of 1075 total…

…showed last 75 words of 1075 total…www.webelements.com/webelements/elements/text/Xe/econ.html Michael Valenti, Nowhere to Hide, Online http://www.memagazine.org/backissues/july99/features/hide/hide.html Nuclear Infromation and Resource Service, Radiation Basics, Online http://www.nirs.org/factsheets/whatisradiation.htm Center for Media and Democracy, Chernobyl, Online http://www.sourcewatch.org/index.php?title=Chernobyl The Columbia Encyclopedia, Element, Online http://www.bartleby.com/65/el/element.html Chemgas, Xenon, Online http://xenon-isotopes.com/center.htm