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- The periodic table of elements may be a table which shows the arrangement of chemical elements ordered by atomic numbers in columns and rows. It had become created by Russian chemist Dmitri Mendeleev in 1869 to look for the periodic trends inside properties of elements.
The periodic table is arranged according to periodic properties in terms of ionization energy electronegativity
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The elements are listed in keeping with their increasing atomic numbers. Rows are arranged in a way that elements concentrating on the same properties belong to precisely the same 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 only are often the groups inside the periodic table, other sorts of groupings of elements often named as well. They can indeed be lanthanoids and actinoids.
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In 2006, the periodic table contained 117 periodic elements. Out of them, 92 are located naturally across the world, and others in the industry are artificial elements.