Periodic Table |
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| What is the Periodic Table Showing? | Periodicity |
The INTERNET Database of Periodic Tables
There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).
| Year: 2010 | PT id = 371, Type = formulation |
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:
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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