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...Years of the periodic table drishtiias com printpdf united nations has designated as international year iypt to commemorate th anniversary establishment chemical elements by dmitri ivanovich mendeleev on february aims recognize importance one most important and influential achievements in modern science reflecting essence not only chemistry but also physics biology other basic sciences disciplines initiative for is supported union pure applied iupac partnership with related organization was first create a earliest such efforts due father antoine lavoisier who classified them terms their properties john newlands introduced concept octaves wherein repeat every eighth element comparison s designed order increasing atomic weight while according number facts about there are confirmed among those can be found nature others strictly man made technetium hydrogen lightest its uranium heaviest an helium neon argon krypton xenon radon known noble gases they were believed unreactive recent studies...