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The INTERNET Database of Periodic Tables


There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.

pre 1900 formulations 1900 to 1949 formulations 1950 to 1999 formulations 2000 to 2009 formulations Spiral formulations 3 dimensional formulations
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2005

Laing's Revised Periodic Table with the Lanthanides Repositioned

Michael Laing's "Revised Periodic Table with the Lanthanides Repositioned", from Foundations of Chemistry 7:203-233.

  • The new system emphasizes oxidation states.
  • The elements Eu and Yb fall directly below Ba, indicating the common oxidation state of 2+.
  • Elements La, Gd, Lu fall in a column below Y, all having the dominant oxidation state 3+.
  • Ce and Tb fall between Zr and Hf in keeping with their 4+ oxidation state. Pm (Z=61) lies immediately below Tc (Z=43), both without stable naturally occurring isotopes.
  • The easily attained oxidation states of 2+ for Am and No, and 4+ for Bk are evident from the analogous positioning of the actinides.

Philip Stewart's modification of the Laing formulation:

Philip Stewart says (in a personal communication):

"It seems wrong to suggest an analogy between Pr to Sm and Dy to Tm with the V, Cr, Mn, Fe groups. I have pushed them to the right to suggest that those lanthanides are like the old group VIII (including the coinage metals); like them they cannot use all their outer electrons in bonding (with the exception of Ru viii and Os viii. I have treated the actinides differently to take account of Pa v and U vi. It's ability to lose the juxtaposition of Tc and Pm, but it is physical rather than chemical anyway."

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pre 1900 formulations 1900 to 1949 formulations 1950 to 1999 formulations 2000 to 2009 formulations Spiral formulations 3 dimensional formulations
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Periodic Table, What is it showing?
Binary Compounds

© Mark R. Leach 1999-


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