Question

Why was the basic of classification of elements changed from the atomic mass to normal number?

Answer 1

the basic of classification of elements changed from the atomic mass to normal number is that due to The modern periodic table removes all the anomalies and drawbacks of the Mendeleev's periodic table based on the increasing atomic mass by changing the basis of classification to atomic number. ... (a) All the isotopes of an element are now placed in the same position because they all have the same atomic number.

Answer 2

Answer:

Explanation:

atomic number is most suitable than atomic weight the physical and chemical properties of atoms of elements depend on number of electrons and their arrangement that is electron configuration which in turn depends upon atomic number show the basis of classification of elements was changed from atomic mass to the atomic number.