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Dobereiner arranges elements in groups of three, called triads, according to similar chemical and physical properties.
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Organized elements into groups of eight, with elements arranged in increasing atomic mass.
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Arranged elements in table of increasing atomic mass, predicted discovery of new elements.
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At the same time as Mendeleev, Meyer also published his own table of elements, arranged by increasing atomic mass
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Determined the atomic mass of elements and arranged them.
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Co-discovered 10 new elements through work with nuclear reactors, moved 14 elements out of the main body of periodic table to below the anthanoids, became known as actinoids.
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