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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.

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1808

Dalton's Elements

Two pages from John Dalton's 1808 book A New System of Chemical Philosophy in which he proposed his version of atomic theory based on scientific experimentation (see the scanned book, page 219):

Dalton's Elements (1808)
Hydrog. 1 Hydrogen 1.0 Strontites 46 Strontium 87.6
Azote 5 Nitrogen 14.0 Barytes 68 Barium 137.3
Carbone 5 Carbon 12.0 Iron 50 Iron 55.8
Oxygen 7 Oxygen 16.0 Zinc 56 Zinc 65.4
Phosphorus 9 Phosphorus 31.0 Copper 56 Copper 63.5
Sulphur 13 Sulfur 32.1 Lead 90 Lead 200.6
Magnesia 20 Magnesium 24.3 Silver 190 Silver 107.9
Lime 24 Calcium 40.1 Gold 190 Gold 197.0
Soda 28 Sodium 23.0 Platina 190 Platinum 195.1
Potash 42 Potassium 39.1 Mercury 167 Mercury 200.6

Note the seemingly huge errors in the atomic weights, compared with modern values. These errors occured because while Dalton had deduced that atoms combine in fixed (stoichiometric) ratios in compounds, he not always know what the ratios were. Thus there were two unknowns: the atomic weights (masses) and the stoichiometric ratios.

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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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