John Newlands - He arranged elements into sets of eight called octaves based on similar chemical properties, Glenn Seaborg - He added the lanthanide and actinide series in the periodic table, Johanes Dobereiner - He arranged elements into sets of three called triads based on similar chemical properties, Dmitri Mendeleev - He arranged elements in periods and groups in the increasing order of atomic weights., Henry Moseley - He arranged elements in order of increasing atomic number, William Ramsay - Discovered helium, argon, neon, krypton, and xenon,

DEVELOPMENT OF PERIODIC TABLE

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