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How did Mendeleev arrange the elements in the periodic table?

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Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table. read more

Mendeleev arranged the periodic table in order of increasing atomic weight of the elements. He determined that there was a pattern when he arranged these elements into horizontal rows. read more

Mendeleev also arranged the elements known at the time in order of relative atomic mass relative atomic mass: The relative atomic mass is the number of times heavier an atom is compared to one twelth of a carbon-12 atom., but he did some other things that made his table much more successful. read more

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