Unformatted text preview: : the numeric system (1–18) used here is the current IUPAC convention.
Atomic weights (mean relative masses): Apart from the heaviest elements, these are the IUPAC 2007 values and given to 5 significant figures. Elements for which the atomic weight is given within square brackets have no stable nuclides and are represented
by the element’s longest lived isotope reported at the time of writing.
©2007 Dr Mark J Winter [WebElements Ltd and University of Sheffield, [email protected]]. All rights reserved. For updates to this table see http://www.webelements.com/nexus/Printable_Periodic_Table (Version date: 21 September 2007). The WebElements™ printable periodic table
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