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: 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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