Mendeleev's Predicted Elements
Professor Dmitri Mendeleev published the first periodic table of the chemical elements in 1869 based on properties which appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table, and predicted that as-yet unknown elements existed with properties appropriate to fill those gaps.
Read more about Mendeleev's Predicted Elements: Prefixes, Original Predictions From 1870, 1871 Predictions
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