Why modern periodic table is superior than Mandeleev's periodic table?

Modern periodic table is based upon atomic number which is a more fundamental property of the atom. It removes the anomaly about the position or isotopes in the Mendeleev's Table.

Explanation:

To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.

the awnser is group 12