A hundred and fifty years ago, the Rare Earths posed a serious problem to Mendeleyev because of their very similar chemical properties, although their atomic mass dispersions pointed to different elements. This difficulty persisted for several decades and only the emergence of the atomic
theory provided some legiti- macy for their consideration as a full series of 15 elements resulting from the filling of the 4f orbitals (La-4f0 to Lu-4f14 ), to which scandium and yttrium were added for the sake of chemical similarities. However, it is difficult to give
up bad habits and major advances in transition metal chemistry started systematically with d-block cations prior to extension to f-block analogues, and this despite the broader perspectives often brought by the latter. The technology-oriented society put in place for economic reasons during
the last five decades has reactivated scientific interest in the Rare Earths, which have now become essential for many applications in telecommunications, lasers, magnetic materials and optical devices.
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Document Type: Editorial
Department of Inorganic and Analytical Chemistry, University of Geneva 30 quai E. Ansermet, CH-1211 Geneva 4 ;, Email: [email protected]
Publication date: March 1, 2019
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International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions
CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.
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