It would be very difficult to remember all these chemicals and their properties and the atomic weights under which they exhibit the properties. Mendeleev spent years formulating the table in order by studying the chemical elements individually. It is even today one of the biggest contributions to the world of chemistry. However, Mendeleev's periodic table was modified as newer elements were found by scientists. However, even all the current models of periodic tables still follow the same thumb rule.

The modern day periodic tables are organized based on atomic numbers instead of atomic weights as it makes more sense to do that. When Dmitri found the periodic table, there were not as many elements. Today, there are several hundreds of them more.

Mendeleev realized the importance of having an organized structure so that things can be sorted out and chemical elements can be easier to study. The development of tie table has contributed in several ways for chemists across the world. Also, after the first sixteen years of the discovery of Mendeleev's table, the missing elements like scandium, gallium, and germanium were found and the table made more sense after that. Several elements have been added to the original periodic table after Mendeleev's initial discovery initially.

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