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His general endeavor seemed to be to convince his auditors that in most basic salts oxygen is divalent, being in direct combination with the acidifying constituent of the molecule, but that when oxygen is not so directly related to this constituent in basic salts it is tetravalent. In the geological section, Dr.
Thus, tin may be trivalent, SnCl , or tetravalent, SnCl . Accordingly elements have been classed as monads, dyads, triads, etc.
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