The INTERNET Database of Periodic Tables
|2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I|
Scandium Group and The Periodic Table: Sc, Y, Lu, Lr or Sc, Y, La, Ac?
Pieter Thyssen and Koen Binnemans discuss (CRC Handbook on the Physics and Chemistry of Rare Earths, Chapter 248. Accommodation of the Rare Earths in the Periodic Table: A Historical Analysis) the confusion surrounding the members of and the positioning of the scandium group. There are three forms commonly used.
A medium-long form and long form depiction of the 15LaAc periodic table. As should be clear from the long form periodic table, an intermingling occurs between the f-block and d-block:
A medium-long form and long form depiction of the 14CeTh periodic table. The d-block has been torn apart in the long form, due to the insertion of the f-block:
A medium-long form and long form depiction of the 14LaAc periodic table. The 14LaAc periodic table is in perfect agreement with the Madelung rule:
A recent graphic posted by Eric Scerri:
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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