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- The periodic table of elements is definitely a table which shows the arrangement of chemical elements ordered by atomic numbers in columns and rows. It was invented by Russian chemist Dmitri Mendeleev in 1869 to discover the periodic trends on the properties of elements.
Physics Archive March 29 2018 · Some Periodic Tables
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The weather are listed according to their increasing atomic numbers. Rows are arranged in a manner that elements with just one properties fit into the equivalent vertical columns. The groups or columns are numbered 1-18. The arrangement is Group 1(alkali metals), Group 2(alkaline earth metals), Group 15 (pnicogens), Group 16(chalcogens), Group 17(halogens) and Group 18(noble gases). There are a few groups that enjoy non-systematic names as well. Besides could be the groups within the periodic table, other groupings of elements often named as well. They are lanthanoids and actinoids.
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In 2006, the periodic table contained 117 periodic elements. Out of those, 92 can be found naturally we know, and other parts are artificial elements.