Mendeleev was able to predict the existence of unknown elements using his periodic table.

Name: Mendeleev was able to predict the existence of unknown elements using his periodic table.
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Question

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Mendeleev left gaps in his periodic table for elements that were yet to be discovered. He predicted the properties and atomic masses of these unknown elements based on their position in the table, and these predictions were later proven correct when these elements were discovered.

Mendeleev Was Able to Predict the Existence of Unknown Elements