image: Some chemists might see the periodic table of elements as a holy testament to the power of science. However, when it first debuted, it was a different kind of holey, and its journey to ...

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The periodic table is arguably the most recognizable tool in chemistry. In 1869, Dmitri Mendeleev arranged the elements known at the time from lightest to heaviest, starting a new row whenever the ...

Editor’s note: The following, originally published with the title “Putting the Elements in Their Places,” is the introduction to the Scientific American Classics special digital edition,“The Quest for ...