Word: compound
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Dates: during 1890-1899
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...since all the metals were composed of these four elements and no others, it would be possible to convert the baser metals into the precious ones by a simple change. The decomposition of water by Lavasier, of course, broke up this theory, since one of the supposed elements was compound, and not an element in itself. Very soon after this we have the Daultorian theory of atoms which is our modern chemical theory...