- The periodic table of elements is often a table which shows the arrangement of chemical elements ordered by atomic numbers in columns and rows. It turned out designed by Russian chemist Dmitri Mendeleev in 1869 to look for the periodic trends from the properties of elements.
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The weather are listed as outlined by their increasing atomic numbers. Rows are arranged to the extent that elements with the exact same properties fit into similar 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 some groups that enjoy non-systematic names as well. Not simply might possibly be the groups on the periodic table, many other groupings of elements often named as well. They are really lanthanoids and actinoids.
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In 2006, the periodic table contained 117 periodic elements. Out of these, 92 are merely naturally remaining, and the rest are artificial elements.