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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 table formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R Leach.
pre 1900 formulations 1900 to 1949 formulations 1950 to 1999 formulations post 2000 formulations Spiral formulations 3 dimensional formulations
Data mapping periodic tables Miscellaneous periodic tables Books and reviews non-chemistry periodic tables All periodic tables

Mass Anomaly Periodic Table

Pairs of atoms where atomic mass does not follow atomic number.

 
Co
=
 58.933  
Ni
=
 58.69
 
Ar
=
 39.948  
K
=
 39.098
 
Te
=
 127.60  
I
=
 126.90

Nature's little quirk – due to the intricacies of nuclear chemistry and isotopic abundance – caused no end of difficulties to the developers of the periodic table in the mid-nineteenth century. Scientists could determine atomic mass, but knew nothing of protons or atomic numbers.

The tellurium-iodine anomaly was a particular problem.

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

© Mark R. Leach 1999-2009

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