Mendeleev's early periodic table predicted the existence of elements that had yet to be discovered.

Name: Mendeleev's early periodic table predicted the existence of elements that had yet to be discovered.
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Mendeleev's periodic table left gaps in the positions of certain elements, suggesting their existence and properties. Later, these elements were discovered and found to fit within the predicted gaps.

Mendeleev's Early Periodic Table Predicted the Existence of Elements That