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he predicted that there were elements not yet discovered

so yeah.

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13y ago
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12y ago

Yes, it is true; Mendeleev supposed that these places will be occupied in the future by the new discovered elements.

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Q: Did Mendeleev leave gaps in the table for undiscovered elements?
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The greatest triumph of Mendeleev's periodic table was his predictions of the existence of the undiscovered elements.


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