Attempts of elements classification: The Development of the Periodic Table

The video tutorial discusses the history of element discovery, starting with gold, silver, copper, and iron. By 1800, 30 elements were known, and over the next century, more than 60 were identified. Scientists sought patterns among these elements, leading to Dmitry Mendeleev's creation of the periodic table in 1869. Mendeleev arranged elements by atomic mass and identified gaps, predicting the existence of undiscovered elements. His predictions were later confirmed as new elements were found.

How did Mendeleev handle the gaps he found in the patterns of elements?

What was one of the significant outcomes of Mendeleev's predictions about undiscovered elements?