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 | | In 1902, in an attempt at a chemical conception of the ether, he put forward the (wrong) hypothesis that there are in existence two chemical elements of smaller atomic weight than hydrogen, and that the lighter of these is a chemically inert, exceedingly mobile, all-penetrating and all-pervading gas, which constitutes the aether. |
 | | Mendeleev also devoted much study to the nature of such indefinite compounds as solutions, which he looked upon as homogeneous liquid systems of unstable dissociating compounds of the solvent with the substance dissolved, holding the opinion that they are merely an instance of ordinary... |
 | | Mendeleev was born in Tobolsk, Siberia, of Ivan Pavlovich Mendeleev and Maria Dmitrievna Mendeleeva (nee Kornilieva). |
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