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Ideas of Dmitri Mendeleev, by Text
[Russian, 1834 - 1907, Professor of Chemistry at St Petersburg University.]
1870
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The Principles of Chemistry
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p.118
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17402
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Mendeleev saw three principles in nature: matter, force and spirit (where the latter seems to be essence) [Scerri]
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p.118
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17400
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Mendeleev focused on abstract elements, not simple substances, so he got to their essence [Scerri]
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p.118
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17401
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Mendeleev had a view of elements which allowed him to overlook some conflicting observations
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I:23
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p.115
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17399
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Elements don't survive in compounds, but the 'substance' of the element does
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