Introducción a la tabla periódica

Dmitry Mendeleev revolutionized chemistry by creating the periodic table, organizing elements by atomic mass and properties. Despite initial challenges in classifying elements, Mendeleev's innovative approach predicted undiscovered elements, proving the periodic table's accuracy and transforming the understanding of chemical elements.

What was Mendeleev's approach to the gaps he found in the periodic table?

In what way did Mendeleev's conviction about undiscovered elements set him apart from other scientists?