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Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
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Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.
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Periodic_Table_by_Quality.svg Source I created this work based on the Image:Periodic table.svg which is public domain Date 2008-09-13 Author Stone 21:17, 13 September 2008 (UTC) Permission (Reusing this file) See below.