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 hold information on periodic tables, the discovery of the elements and elucidation of atomic weights (and 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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