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Isotopes are different types of atoms (nuclides) of the same chemical element, each having a different number of neutrons. Correspondingly, isotopes differ in mass number but not in atomic number. The difference in the number of nucleons comes from a difference how many neutrons are in the atomic nucleus. The number of protons (the atomic number) is the same because that is what characterizes a chemical element. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14, respectively. The atomic number of carbon is 6, so the neutron numbers in these isotopes of carbon are therefore 12−6 = 6, 13−6 = 7, and 14–6 = 8, respectively. A nuclide is an atomic nucleus with a specified composition of protons and neutrons. The nuclide concept emphasizes nuclear properties MEH. over chemical properties while the isotope concept does the converse; for the neutron number has drastic effects on nuclear properties but negligible effects on chemical properties. Since isotope is the older term, it is better known, and it is still sometimes used in contexts where nuclide would be more proper, such as nuclear technology. An isotope or nuclide is specified by the name of the particular element (this indicates the atomic number implicitly) followed by a hyphen and the mass number (e.g. helium-3, carbon-12, carbon-13, iodine-131 and uranium-238). When a chemical symbol is used, e.g., "C" for carbon, standard notation is to indicate the number of nucleons with a superscript at the upper left of the chemical symbol and to indicate the atomic number with a subscript at the lower left (e.g. 32He, 126C, 136C, 13153I, and 23892U). There are about 339 naturally occurring nuclides on Earth, of which 288 are primordial nuclides and 269 are "stable". To be precise, the nuclides termed "stable" are nuclides which have never been observed to decay. This qualification is necessary because many "stable" isotopes are predicted to be radioactive with very long half-lives. Adding in the radioactive nuclides that have been created artificially, there are more than 3100 currently known nuclides. From Wikipedia under the
GNU Free Documentation License What is the difference between isomers and isotopes? Q. I'm writing a paper on organic chemistry, but I don't know the difference between isomers and isotopes. I've read the dictionary definitions of each, but they're kind of confusing to me. I just need to know which word to use to explain the different forms of carbon that make all the different compounds that we see in everyday life. Help please? Asked by Dragon Aura - Sun Apr 30 15:20:44 2006 - - 7 Answers - 0 Comments A. Isomers are molecules with the same chemical formula but different structures. Isotopes are atoms of the same element but have different numbers of neutrons. The right one for carbon is isomer Answered by The answer - Sun Apr 30 15:24:39 2006 What are the masses of the smallest and largest isotopes of silver? Q. What are the masses of the smallest and largest isotopes of silver? I need to know pronto. PLEASE! Asked by Sharisi - Thu May 14 15:57:39 2009 - - 1 Answers - 0 Comments How would you expect the chemical properties of isotopes of the same element to compare to each other?
Q. Explain your answer. (hint: Think about what defines isotopes. Also think about electrons and reactivity) Asked by Dustin D - Sun Jul 20 06:02:46 2008 - - 1 Answers - 0 Comments A. different isotopes of the same differ by the # of neutrons in the nucleus, not in the electron configuration. it is that outer electron configuration that determines a material's chemical reactivity. since isotopes of the same element have the same electron config, I expect their reactivity to be extremely similar Answered by Steve O - Mon Jul 21 23:53:34 2008 From Yahoo Answer Search: "isotopes"  news.google.com Los Angeles Times Isotopic analysis of carbon-13 and carbon-12 in its body shows that the ratio of the two isotopes is identical to that of the plants, indicating that the ... and more » news.google.com Middle East Online The term depleted refers to its being depleted of the U-235 isotope needed for fission reactions in nuclear reactors. The nuclear waster material from ... and more » news.google.com Telegraph.co.uk They can also determine the temperature of the climate when the snow fell, by the proportion of two different isotopes of oxygen in the ice. ... From Google News Search: "isotopes"  atomicarchive.com 376px x 280px | 18.70kB [source page] and neutrons in an atom is the atomic mass number This value is denoted by the symbol A The number of neutrons in an atom is denoted by N Thus the mass of an atom is A = N + Z Nuclear Isotopes Atoms with the same atomic number but with different atomic masses are called isotopes Isotopes have identical chemical properties yet have very different  gly.uga.edu 723px x 500px | 127.10kB [source page] for the smallest organisms and mineral particles A figure showing Organic Structures and Functional Groups Relevant to Geochemistry and Environmental Chemistry A plot of the Abundances and half lives of c n o and S isotopes A plot of Ionic charge and radius from C4 to Mn7 + A figure comparing From Yahoo Image Search: "isotopes"  popsci.com Pat Walters hu, 05 Nov 2009 19:02:55 GM Before it broke, the reactor produced nearly two thirds of the U.S. supply of molybdenum-99, or Mo-99, the . isotope. behind 16 million critical diagnostic medical tests each year. In July, things got worse: The Dutch reactor that supplied ...  tanystropheus.wordpress.com tanystropheus hu, 12 Nov 2009 20:45:11 GM However, the debate concerning the mihirungs has been complicated by an analysis of Genyornis eggshell . isotopes. which, according to Paul, indicates that they were browsers Murray and Megiran came to the same conclusion on the basis of ...  gimmeatee.com admin ue, 03 Nov 2009 15:32:21 GM Show your love for the greatest AA Baseball team since the New Britain Rock Cats. From Google Blog Search: "isotopes" |
