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The Periodic Table of Elements Version 2.0

  1. Mendeleev was so sure of the predictions in his periodic table, that when a French scientist’s discovery of one of these elements didn’t match his data, Mendeleev said he was wrong—and he did end up being wrong.

  2. Today’s periodic table is grouped into alkali metals, alkaline earth metals; transition metals; halogens; metals, metalloids, gases, and nonmetals; lanthanides; actinides; and noble gases.
  3. Other scientists were trying to discover the same thing, but a few things set Mendeleev apart: he was obsessive, and he realized that the periodicity of elements had far-reaching consequences.

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