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- The periodic table of elements is usually a table which shows the arrangement of chemical elements ordered by atomic numbers in columns and rows. It was subsequently introduced by Russian chemist Dmitri Mendeleev in 1869 to determine the periodic trends from the properties of elements.
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The weather are listed depending on their increasing atomic numbers. Rows are arranged in such a way that elements with similar properties succumb to the exact 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 numerous groups that enjoy non-systematic names as well. Not only will be the groups inside the periodic table, another sort of groupings of elements often named as well. They can be lanthanoids and actinoids.
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In 2006, the periodic table contained 117 periodic elements. Out these, 92 are located naturally in the world, and others in the industry are artificial elements.