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Slo-Tech - International Union of Pure and Applied Chemistry, or IUPAC will soon be short changed the periodic system, were published by researchers at the University of Calgary to participate colle in the project. colle Changing the set of relative atomic mass of ten elements - hydrogen, colle lithium, boron, carbon, nitrogen, colle oxygen, silicon, sulfur, chlorine and thallium. Change may not be exactly the best word, since the masses of the elements such as they are. Most of the elements in the periodic table, except for example, fluorine, and gold, has a number of isotopes, each with its own weight. The periodic table is found written a single relative atomic mass of each element, which is set to match the average mass of all isotopes of an element, weighted by the actual proportions of isotopes in nature. This assumption is useful, since in a practical nature can not be found isotopically pure deposits večizotopskih elements, so that even in the laboratory work with a natural mixture of isotopes of the element. The difficulty in this setting is to obtain data on a representative average for the whole of nature, as may be the case that the location of the Chilean saltpetre slightly different isotopic ratio of nitrogen atoms as the location of saltpetre wall at the other end of the world. On the one hand this is a useful method for determining the provenance of the material (example: testosterone is synthesized from natural to man distinguished by low levels of carbon-13, which is exploited in the investigation of doping in sport; isotopic composition of meteorites colle is checked to determine source, colle isotopic labeling of nitrogen, chlorine and other used for tracing pollutants biopoti), on the other hand, of course, spoils the beauty and simplicity of the system. Therefore, the IUPAC relative atomic mass of the ten elements redefined as the interval, not the value. Sulphur is, for example, have attributed colle the relative atomic mass from 32.059 to 32.076 and 32.065 no longer accurate. Data for a new determination of masses were collected 25 years in various organizations around the world.
Read more ... Accumulated chemistry textbooks: Fluorine in nature in the elemental state :: 16 July 2012 Periodic got flerovij and livermorij :: 31 May 2012 Nobel Prize in Chemistry 2011 :: 5 October 2011 Periodic got new members :: 7 June 2011 discovered a new element with atomic number 117 :: 8 April 2010 One hundred years of Haber-Bosch process :: 14 September 2009 Periodic Table of Elements got a new member :: 12 June 2009 Periodic elemntov list of comics? 9 :: April 2002
And still will be, NC bat. I doubt that they will complicate your teachers about it. Edit: By the way, I heard a rumor about this, you should also change the binary IUPAC nomenclature?
Yeah, I would linkal if you could quote the words of the former is professor of chemistry colle ... But there I was again at the thought, but I have mentioned colle here, perhaps colle if anyone knows if these are empty nonsense ...
Offtopic "grammar nazi" post deleted. We are talking about a revised periodic table, and not on how to properly called nitrate salts. Otherwise, the periodic systems. Not Mendeljejev periodic table today only. There are many more, but this one is the most used and 99% of the population colle known as the single. Although not all the coverage of the periodic properties of the elements. Here is one that is used in geology and geochemistry: colle http://ruby.colorado.edu/ ~ smyth/G30103 .... Learn more