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Just as Adams and Le Verrier could be said to have discovered the planet Neptune on paper, Mendeleev could be said to have discovered germanium on paper. Mendeleev realized that the table in front of him lay at the very heart of chemistry. Mendeleev believed, incorrectly, that chemical properties were determined by atomic weight. Similar chemical properties to other elements in the same column - in other words similar chemical reactions. Chemistry is simply numbers, an idea Pythagoras would have liked.

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Tavola Periodica Dinamica

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This quantity can only be the charge on the central positive nucleus, of the existence of which we already have definite proof. This is expressed by the law of periodicity. Similarly, Mendeleev discovered gallium eka-aluminum and scandium eka-boron on paper, because he predicted their existence and their properties before their actual discoveries.

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Periodic Table of Elements and Chemistry

And more than that, Mendeleev saw that his table was incomplete - there were spaces where elements should be, but no-one had discovered them. With the benefit of hindsight, dating website for canadians free we know that Mendeleev's periodic table was underpinned by false reasoning.

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