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1740-1794
He was one of the very first to study pure elements, a meticulous experimenter, revolutionized chemistry. He established the law of conservation of mass, determined that combustion and respiration are caused by chemical reactions with what he named “oxygen,” along with the first step in experimenting with other gasses, and helped systematize chemical nomenclature, among many other accomplishments.

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1837-1898
an English scientist called john new lands put forward his law of octaves in 1864 . he arranged all the elements known at the time into a table in order of relative atomic mass when he did this the found a pattern among the early
elements

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1820-1886
He formed the early periodic table, and called it the telluric helix. He was also the first to see the periodicity of the elements, and arranged them by the known atomic masses.

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He observation development of the periodic system of elements. He showed that in each triad the mean of the lightest and heaviest atomic weights of the middle element. He also discovered the organic compound furfural and developed the separation of calcium and magnesium.

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1830-1895 German Chemist
Arranged elements by atomic weight and discussed the relations between atomic weights and properties of the elements. Developed the classification of elements. He then created his own table a graph relating atomic volume and atomic number.

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he experimented with ignition of hydrogen on contact with powdered platinum led the Swedish chemist J.J. Berzelius to develop the concept of catalysis.  Created the periodic system of triads, where he grouped elements by 3.6

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1887-1915
he prove that every element's identity is uniquely determined by the number of protons it has. His discovery revealed the true basis of the periodic table and enabled Moseley to predict confidently the existence of four new chemical elements,

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Seaborg was known for isolating and identifying transuranium elements Seaborgium was named after him

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Seaborg 1912-1999
Seaborg was known for isolating and identifying transuranium elements Seaborgium was named after him
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