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  1. Nihonium , Moscovium, Tennessine and Oganesson are  the most recent elements included in the periodic table. The 113,115,117 and 118 are met the criteria to include in periodic table. These are heavy metals and are included in the periodic table after acceptance of the IUPAC (International Union of Pure and Applied Chemistry ) on December 30, 2015 and officially on 28 November 2016.