Question

Define Modern periodic law

Answer 1

Answer:

Atomic mass depends upon the number of protons and neutrons in the nucleus. On the other hand, the atomic number implies the number of electrons in the extranuclear part of the number of protons in the nucleus.

Since the nucleus is deep-seated in an atom and is also shielded by electrons in the extranuclear part, therefore, the atomic mass has little effect on the chemical properties of the elements. Electrons are exposed to the environment. Hence, they can interact with the reagent. As a result, the physical and chemical properties of the elements depend upon their atomic numbers rather than the atomic masses.