Where Mendeleev was wrong: predicted elements that have never been found

@article{Lente2019WhereMW,
  title={Where Mendeleev was wrong: predicted elements that have never been found},
  author={G{\'a}bor Lente},
  journal={ChemTexts},
  year={2019},
  volume={5},
  pages={1-9}
}
This contribution gives a detailed account of the element predictions Dmitri Ivanovich Mendeleev made after setting up the periodic table of the elements in 1869, with a special focus on those that turned out to be unsuccessful. It is argued that most of these instances are connected to a general inability to place the rare earth metals correctly into the system. Furthermore, details of conceiving the ideas for two lighter-than-hydrogen elements, newtonium and coronium, are discussed. An… Expand
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