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John Dalton
John Dalton gave all the (36) elements a symbol and arranged them in order of atomic mass. -
Johann Dobereiner
At this time 55 elements have been discovered so Johann Dobereiner combined the elements into groups of 3 -
John Newlands
Arranged 60 known elements by there atomic mass in a grd called the law of octaves -
Dmitri
Used cards to arrange elements by atomic mass, and relation. -
Electrons
Discovery of electrons by J.J. Thomson. -
Modern table
Used atomic number instead of atomic mass -
Electron Config
Discovery of electron configuration. This led to a change in the periodic table creating the table as we know it today. -
Antoine-Laurent
Seperated Elements in Metals, Non-metals and 'Earths'