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HENNIG BRAND discovered the first element PHOSPHORUS
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JOHANN DOBEREINER discovered the halogen triad and the alkali metal triad.
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The first periodic table was created by A.E.BEGUYER DE CHANCOURTOIS. He assembled the table by transcribing a list of the elements positioned on a cylinder in terms of increasing atomic weight.
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JOHN NEWLANDS published his version of periodic table and proposed the law of octavos (by analogy with the seven intervals of the musical scale).
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RUSSIAN DMITRI MENDELEEV published his periodic table , eventually becoming the " father of the periodic table ". till this time 63 elements were discovered.
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LOTHAR MEYER published his periodic table.
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LORD RAYLEIGH discovered ARGON , a new gaseous element that was chemically inert and didn't fit in the current groups. It was later suggested to place argon between chlorine and potassium .
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WILLIAM RAMSEY helped to establish zero group ( for zero valency ) and predicted the future discovery of element neon.
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ERNEST RUTHERFORD created studies of alpha particles of heavy nuclei which led to the nuclear charge. A.VEN.BROEK established that the atomic weight of an element was approximately equal to the charge on an atom . This charge was later termed as atomic number .
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HENRY MOSELEY published results of the x-ray wavelenght of many elements which proved that the element are in order by atomic number.
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GLENN SEABORG discovered plutonium and the transuranic elements from 92 to 104 . His findings represents the last (and the most ) recent changing to the periodic table .
