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John Wolfgang Döbereiner
He made one the first attempts of classifying the elements and combining them into a structured format. He didn't use periods or groups instead he used 'Triads' the table itself was split up into three triads. -
Alexandre-Emile Béguyer de Chancourtois
He was one of the first people to notice that if the elements were organised in order according to their atomic weight, then they would be grouped with elements sharing similar properties. -
John Newlands
He classified the sixty-eight known elements into eight groups based on their physical properties. -
Dmitri Ivanovich Mendeleev
He was the first scientist to generate a table similar to the one we use today. He arranged the elements in order of their atomic mass corresponding to their relative molar mass. -
Glenn T. Seaborg
He proposed a different block of elements, this section is now called the f-block. -
Henry Moseley
He found a relationship between the x-ray wavelength of an element and its atomic number. He was then able to arrange the elements in order of their nuclear charge.