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: 2004 | PT id = 132, Type = data |
Mass Anomaly Periodic Table
Pairs of atoms where atomic mass does not follow atomic number.
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Co
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=
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58.933 |
Ni
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=
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58.69 | ||
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Ar
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=
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39.948 |
K
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=
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39.098 | ||
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Te
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=
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127.60 |
I
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=
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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.
By Mark Leach
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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