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)|
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.
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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